Thermal Underwear for Kids

Items for sale: 37
Price range: £5.99 - £21.99
Last updated: Tue Nov 18 19:15:36 GMT 2025

Keanu Heatforce Kids Thermal Vests - Pack of 5 - Winter Warm 0.45 TOG Brushed Underwear - Ages 3-15 Years (5 Pack White Vests - 7-8 Years)

  • HEATFORCE KIDS THERMALWEAR BY KEANU: HeatForce Kids Thermal Vests offer more than just your average warmth, with their soft brushed inner and ribbed fabric. They effortlessly combine style and functionality, designed to keep your kids warm during chilly days and nights, these vests also feature seamless sides for extra comfort. These vests reflect Keanu's commitment to fashion and comfort. Enhance your child's winter wardrobe with these practical and stylish essentials.
  • 0.45 TOG RATED BRUSHED BASELAYERS: Lightweight tops made with thermal technology and cotton blend, brushed inner fabric that optimizes heat retention by trapping a cosy layer of warmth close to your skin. our base layers with a 0.45 Tog Rating are designed to provide the perfect level of thermal comfort. The lightweight yet insulating nature of this rating ensures that you can stay cosy without feeling weighed down, making it an excellent choice for versatile and all-day wear.
  • ECO FRIENDLY KIDS THERMALWEAR: Elevate your wardrobe with our thermal underwear, crafted with sustainability in mind. These vests are composed of a blend of 50% Cotton, 50% polyester, ensuring both comfort and durability. We use reactive dyes that are not only vibrant and long-lasting but also completely free from harmful Azo compounds. This distinguishes our eco-friendly tops from cheaper alternatives, making them a responsible and stylish choice for your clothing collection
  • SHOP THE KEANU COLLECTION: Keanu offers a range of matching mini me outfits/nightwear for parents and kids, from mother and daughter and father and son, to the whole family. Complete the look with our other products, Coordinating slippers and accessories available.
  • KIDS PACK OF 5 UK SIZES: Our thermal collection, now available in practical packs of 5, ensures that your little ones are well-prepared for the winter season. With various UK sizes, including 3-4, 5-6, 7-8, 9-10, 12-13, and 14-15 years, these thermals offer exceptional value for your money. As a 5-pack, they'll last all winter, making them perfect for wearing under school uniforms and keeping your children warm during school hours and beyond.
Keanu Heatforce Kids Thermal Vests - Pack of 5 - Winter Warm 0.45 TOG Brushed Underwear - Ages 3-15 Years (5 Pack White Vests - 7-8 Years)
by Keanu
£10.99 - £11.99
Last change: 2025-11-18
SKU: B0CMZBHV3Z

Zando Kids Black Thermal Base Layer Set 2-3 Years, Kids Thermal Long Sleeve Top & Tights Leggings Set, Black, 2-3 Years

  • MATERIAL DESCRIPTION: This children's thermal underwear is made of 62% acrylic, 28% viscose, 10% spandex composition, wear-resistant, no pilling, no fading, no deformation, no adverse effects on your child's delicate skin, well-made.
  • UNIQUE DESIGN: The top of this kids suit is a round neck pullover design, and the trousers are just to ankle length, guaranteeing your child's warmth in spring and autumn seasons, and can also be worn as an inner layer in winter.
  • COLOUR MATCHING CHOICE: This children's thermal underwear has five colour matching options: black, white, navy, light grey, bright red and two cute options:light pink, pale purple. Classic five neutral colours to meet the needs of most children, light pink and pale purple are very sweet and cute.
  • SIZE CHOICE: This children's thermal underwear has four sizes to choose from: 90 (for 2-3 year olds), 100 (for 3-4 year olds), 110 (for 4-5 year olds),120 (for 5-6 year olds), please choose the most suitable size for your child according to his/her age and the size chart.
  • WEARING OCCASION: This kids' thermal underwear is perfect for student wear, casual wear, sportswear, loungewear or outdoor wear in winter, spring, autumn, etc. It is one of the must-have items for your child's daily wear.
Zando Kids Black Thermal Base Layer Set 2-3 Years, Kids Thermal Long Sleeve Top & Tights Leggings Set, Black, 2-3 Years
by Zando
£12.49
Last change: 2025-11-18
SKU: B0DLWGK1GQ

Kids Thermal Winter Warm Underwear Set Long John Bottom and Long Sleeve Top Size:Age 9-11 Years (Unisex Boy Girl Children) Colour:Charcoal Grey

  • KEEP YOUR LITTLE ONES WARM: This kids thermal underwear base layer gives protection against the cold winter days whilst remaining discreet and comfortable.
  • FULL SET: Long sleeve top and long john legging trousers included. These can be used for boys thermal underwear or girls thermal underwear
  • Thermal trouser and thermal top. Great for those cold winter days, school, ski/snow holidays, camping, pyjamas, hiking, outdoor trips.
  • SOFT AND COMFORTABLE: Our thermal underwear is has some natural stretch for the perfect fit.
  • BUY WITH CONFIDENCE: This set is covered by our Britwear 101 day guarantee.
Kids Thermal Winter Warm Underwear Set Long John Bottom and Long Sleeve Top Size:Age 9-11 Years (Unisex Boy Girl Children) Colour:Charcoal Grey
£8.49 - £8.97
Last change: 2025-11-18
SKU: B00B0OMSR8

Kids Thermal Underwear Skins Set Long Sleeve Top Vest and Long Johns Leggings, Boys Girls Base Layer, Football, Sports, Ski Black

  • Children's Extreme Ultralight Warmest Top and Tights Sets make all favorite cold weather activities more pleasant. Whether snowboarding; skiing; camping or other outdoor sports; traveling and even sleeping Outland Thermal set keeps your kids comfortable.
  • The Thin Lightweight Thermal Clothing maintains body heat at a cool temperature by wicking moisture away from the skin; drying quickly and insulating from the cold.
  • The Basic Boy and Girl Underwear Undershirt and Bottom Leggings have an interior microfiber fleece that is soft and cozy; feels great against your skin and under a layer of clothing
  • We have your size! For babies, toddlers, youth; juniors; teens; boys, and girls from 2-4 to 14-16. Several solid color options, including a tactical camo shirt and our new HEATHER GREY.
  • Does not restrict movement; feels like a second skin with four-way stretch and gives your kids the needed warmth without thick or heavy layers. The suit Kids Underwear long johns can be repeatedly washed without shrinking. Machine wash dries quickly.
Kids Thermal Underwear Skins Set Long Sleeve Top Vest and Long Johns Leggings, Boys Girls Base Layer, Football, Sports, Ski Black
£15.99
Last change: 2025-11-18
SKU: B01HEZMX30

AMZSPORT Kids Thermal Base Layer Set Warm Fleece Lined Long Sleeve Compression Underwear Tights Winter Top and Bottom for Boys Girls Football Skiing Athletic Black XL

  • WARM & COMFORTABLE: Made from 80% polyester and 20% elastane, this thermal set features a soft fleece lining to keep kids warm and cosy in cold weather. The smooth fabric provides a snug feel, while the tag-free collar prevents irritation for all-day comfort.
  • HIGHLY FLEXIBLE & BREATHABLE: The four-way stretch fabric allows unrestricted movement in all directions, giving kids the freedom to play and stay active. Its breathable design wicks away moisture, keeping them dry and comfortable without feeling stuffy.
  • VERSATILE FOR ALL ACTIVITIES: Ideal for various sports and everyday wear, whether indoors or outdoors. Whether running, jumping, or stretching, this base layer provides flexibility and comfort without restriction.
  • CLASSIC & EASY TO MATCH: Designed in a sleek black colour, this thermal set pairs effortlessly with jackets and accessories, making it suitable for all occasions and activities.
  • CUSTOMER SATISFACTION GUARANTEED: We are dedicated to providing a hassle-free shopping experience with excellent customer support. If you have any concerns about product quality or service, we are here to help and ensure your satisfaction.
AMZSPORT Kids Thermal Base Layer Set Warm Fleece Lined Long Sleeve Compression Underwear Tights Winter Top and Bottom for Boys Girls Football Skiing Athletic Black XL
£13.99 - £14.98
Last change: 2025-11-18
SKU: B0D3X85WGB

Heatwave Children's Thermal Long Sleeve Top & Pants Set, Warm Winter Underwear, Black, 12/13 Years

  • Kids Thermal Long Sleeve Top & Pants Set
  • 0.45 TOG RATING- Hold more warm air close to the skin
  • By Heatwave Thermalwear
  • Size: Age 3-5 Years, 6-8 Years, 9-11 Years or 12-13 Years
  • Machine Washable
Heatwave Children's Thermal Long Sleeve Top & Pants Set, Warm Winter Underwear, Black, 12/13 Years
£8.95 - £9.95
Last change: 2025-11-18
SKU: B076MTCJH8

BEGIANT Kids Base Layer Thermal Underwear Set for Boy Long Sleeve Baselayer Top and Long Johns Football Skins Boys Athletic Compression Underwear Shirt & Tights Set Black

  • ➤Keep Warm & Lightweight: Thermal kids base layers are made of 90% Polyester and 10% Elastane. Thermal for boys skins consists of a long sleeve top and bottoms with elastic waistband. Kids skins is soft and comfy. Light fabric has excellent warm-keeping performance and maximizes warmth by fitting to the body and reducing heat loss. kids thermal base layer set is perfect for daily wear in cold weather
  • ➤Kids Compression Top and Leggings Features: Crew neck T-Shirt, Sports tights with wide elastic waistband, Flat-Lock seams to reduce irritation from chafing for greater comfort during activities. The elasticated design reduces muscle fatigue and soreness, enhances oxygen and blood circulation in the legs and prevents strains caused by children's intense exercise.
  • ➤Moisture Wicking & Quick Dry: Thermal underwear boys football skins are breathable and have a moisture-wicking system, the bottom layer can wick away moisture after the skin sweats, drying quickly and isolating the cold. Keeps the skin dry and gives your child a better wearing experience. Base layer kids keep your kids dry and comfortable all day when football practices and games. Do not worry if your kid has a cold
  • ➤Flat Lock Stitching as Second Skin: kids thermals included long sleeve base layer tops and thermal long johns. Double stitching cuff and neckline (crew neck) . Flatlock seams to prevent chafing and irritation. perfect for children's delicate skin. Ideal as a first layer for everyday life, such as cozy pyjamas at night, or as thermal underwear for outdoor activities in cold weather. Also, 4 way stretch fabric guarantees kids freedom of movement, compression top and leggings for kids sports.
  • ➤Occassion:1.Cold weather boys thermal set- Great to be Wear Alone at Home or Add an Extra Layer Under Clothes; 2.Used for active sports like Skiing, Sledding, Ice Skating, Curling, Ice Hockey, Snowboarding, Soccer, and Running. This football skins kids base layer has minimal bulk and is comfortable to wear for kids. Great Christmas Gift or Halloween Gift for Your Boys.
BEGIANT Kids Base Layer Thermal Underwear Set for Boy Long Sleeve Baselayer Top and Long Johns Football Skins Boys Athletic Compression Underwear Shirt & Tights Set Black
£7.59
Last change: 2025-11-18
SKU: B0D6BR5974

LANBAOSI Kids Thermal Underwear Set Children Boys Base Layer Long Johns Bottoms and Long Sleeve Top Black

  • Kids Base Layer 2 Pcs Set: Long Sleeve Top and Long Johns Bottoms, this Kids Thermal Underwear Set is Great for Boys Girls Daily Wear and Outdoor Sports Like Skiing, Hiking, Walking, Baseball, Hockey, Camping, Mountain Climbing etc
  • Thermal Sets: Features Excellent Wicking Rate, Can Draws Sweat Away from Kids Skin, Provide Extra Warmth, Ideal for Kids Base Layer or Pajamas In Autumn and Winter
  • Material: Polyester & Spandex, Soft and Lightweight for Layering
  • Super Stretch, Ensure Kids Free Movement without Any Restriction
  • Crew Neck, Elasticated Waist Band, Ankle Cuff for Comfort, Your Boys Girls Can Enjoy their Play Time
LANBAOSI Kids Thermal Underwear Set Children Boys Base Layer Long Johns Bottoms and Long Sleeve Top Black
£9.99
Last change: 2025-11-18
SKU: B07WP7MZ73

2you KIDS THERMAL UNDERWEAR SET JUNIOR UNISEX TOP LONG JOHN SLEEVES PJ BASELAYER BOYS GIRLS WINTER (Turquoise, 146-10-11)

  • Perfect as a base layer for your skiing trip, or for the winder colds.
  • Come as a set of both long sleeve top and long john bottms.
  • ThermoActive Thermal Wear
  • Ribbed and breathable
  • Machine Wash normal Max 30 Degree
  • For kids aged 7 - 12 years (unisex)
  • What you Get: 1 x Thermal both Top and Bottom set - Choose colour and size from variation menu
2you KIDS THERMAL UNDERWEAR SET JUNIOR UNISEX TOP LONG JOHN SLEEVES PJ BASELAYER BOYS GIRLS WINTER (Turquoise, 146-10-11)
by 2you
£6.99
Last change: 2025-11-18
SKU: B0BTXB2R66

Kids Base Layer - Athletic Kids Thermal Long Sleeve Top and Leggings Compression Set for Sport Football Basketball Ski Black

  • Keep Warm & Lightweight: Boys base layer consist of a long sleeve top and bottoms with elastic waistband. It is super light, comfy, has excellent warm-keeping performance, and has a windproof function in cold weather. The unisex thermal set will bunch around your children's waistline or sleeves and reduce heat loss.
  • Comfortable Like a Second Skin: This boy's thermal underwear set is ultra soft, comfy, with a seamless inner layer, perfect for children's delicate skin. Suitable as a first layer for daily life like comfortable pajamas on nights, or as thermal underwear for outdoor activities in cold weather.
  • Excellent Flexibility for Any Activities: Boys ski underwear is made of 4-way stretch fabric for full freedom of movement and no bound. Specially designed for indoor and outdoor activities. Such as football, rugby, skiing, ice hockey, biking, snowboarding, walking, running, hunting etc.
  • Moisture Wicking & Quick Dry: The kid's long underwear set is breathable and has a moisture-wicking system, the bottom layer draws moisture away from the skin after sweating, dries quickly, and isolates the cold. Keeping the skin dry will give your child a better wearing experience and no special smell.
  • Kids Compression Top and Leggings Features: Crew Neck T-Shirt, Sports Tights with Wide Elastic Waistband, Flat-Lock Seams To Reduce Irritation from Chafing for Greater Comfort During Activities.
Kids Base Layer - Athletic Kids Thermal Long Sleeve Top and Leggings Compression Set for Sport Football Basketball Ski Black
£14.99
Last change: 2025-11-18
SKU: B0DGXG4VBT

HYCOPROT Kids Thermal Top Warm Winter Compression Shirt Childrens Long Sleeve Youth Lightweight Fleece Base Layer Boys Athletic Quick Dry Warm Underwear for School Football Baseball Soccer Undershirt

  • 【Fabric】 Crafted from 85% polyester / 15% spandex, our youth fleece-lined compression t shirts deliver warmth, lightness, and superior comfort. The blend offers excellent elasticity, breathability, and skin-friendly softness. Plus, the tag-free collar minimizes friction for friction-free comfort.
  • 【4-Way Stretch】 Our kids compression thermal shirt features 4-way stretch fabric for unrestricted movement and muscle support, enhancing flexibility and comfort for all sports performance.
  • 【Flat Seam Design】Our boys' fleece compression underwear feature a flat-seam construction that eliminates friction and irritation, ensuring a smooth and comfortable fit.
  • 【Crew Neck】 Our boys' fleece base layer features a stretchy crew neckline designed for quick changes. Comfortable, non-restricting, and warm for all-day adventures.
  • 【Suitable for Various Sports】 Our boys thermal undershirt is the perfect cold-weather base layer, keeps your child warm and comfy during cold-weather action like baseball, football, hockey, basketball, field hockey, softball, running, lacrosse, soccer and skating.
HYCOPROT Kids Thermal Top Warm Winter Compression Shirt Childrens Long Sleeve Youth Lightweight Fleece Base Layer Boys Athletic Quick Dry Warm Underwear for School Football Baseball Soccer Undershirt
£11.99
Last change: 2025-11-18
SKU: B0FP4MMN9M

SOFTY® 2 Piece Unisex Children Kids Thermal Underwear Long Sleeve Top Warm Vest School (UK, Age, 7 Years, 8 Years, Regular, White)

  • Body contouring guaranteed perfect fit.
  • Ribbed fabric for added stretch and comfort.
  • 35% Cotton, 65% Polyester
  • MACHINE WASHABLE
SOFTY® 2 Piece Unisex Children Kids Thermal Underwear Long Sleeve Top Warm Vest School (UK, Age, 7 Years, 8 Years, Regular, White)
by SOFTY
£10.99
Last change: 2025-11-18
SKU: B07FYNFTT1

Amazon Essentials Boys' Thermal Long Underwear Set, Black, 6-7 Years

  • COTTON BLEND THERMAL: Cut from cotton blend that is lightweight and boasts a waffle knit texture that is lofty yet cozy.
  • EVERYDAY ESSENTIALS: Cotton blend thermal underwear set functions as a lightweight base layer to keep you warm.
  • DETAILS: Long sleeve top with tag free crew neckline and full-length pants featuring front pouch and double layer keyhole fly. Ribbed cuffs at sleeves and leg openings.
Amazon Essentials Boys' Thermal Long Underwear Set, Black, 6-7 Years
£9.50
Last change: 2025-11-18
SKU: B07QHLD5Y6

Roadbox Boys Thermal Underwear Set - Kids Fleece Lined Tops & Bottom Compression Soft Long Johns Base Layer for Skiing Black

  • Reliable Winter Warmth: This youth thermal set is crafted from 95% polyester and 5% spandex, with a fleece lining that captures body heat and blocks cold air. Lightweight yet warm, it offers effective insulation for winter days
  • Moisture Wicking: Designed to keep your child dry, this thermal set wicks moisture away and evaporates sweat quickly, preventing chills caused by perspiration and ensuring comfort during active play
  • Stretchy & Flexible: Made with highly elastic fabric, the thermal underwear adapts to the body's shape for a snug, comfortable fit, perfect for growing kids. It retains its shape and stretch, even after repeated use
  • Soft & Comfortable: This thermal base layer has the advantage of being skin-friendly, providing children with a warm and cosy feel that will not wear out their tender skin, giving them a comfortable and warm dressing experience.
  • Occasion: Whether skiing, playing football, hockey, or hiking, this thermal set keeps your child warm and comfortable during winter adventures. It's a perfect present for any active kids, grandchild, or nephew
Roadbox Boys Thermal Underwear Set - Kids Fleece Lined Tops & Bottom Compression Soft Long Johns Base Layer for Skiing Black
£19.99
Last change: 2025-11-18
SKU: B0DKHKYDWT

Mountain Warehouse Talus Kids Roll Neck Top - Quick Wicking Jumper, Easy Care Turtle Neck Tee, Warm Thermal Baselayer, Lightweight - for Winter, Walking, Hiking Black Kids Size 5-6 Years

  • Moisture Wicking - Actively wicks moisture away from your body and dries quickly
  • Lightweight - Great for travelling, comfortable to wear and easy to pack
  • 2 year warranty - Includes a 2-year warranty for guaranteed quality and peace of mind
Mountain Warehouse Talus Kids Roll Neck Top - Quick Wicking Jumper, Easy Care Turtle Neck Tee, Warm Thermal Baselayer, Lightweight - for Winter, Walking, Hiking Black Kids Size 5-6 Years
£8.49 - £13.64
Last change: 2025-11-18
SKU: B07MXRL53R

Heatwave Thermalwear Girls Thermal Underwear Set Long Sleeve Top and Bottom Pants Winter Base Layer for Kids Warm Cold Weather, Marl Grey 12-13 Years

  • Heatwave Thermalwear is known for dependable winter essentials that deliver consistent warmth and quality. Our women's thermal collection offers reliable layering pieces designed for comfort and long-lasting performance in cold climates.
  • Winter warmth: Keep your child cosy during cold months with this girls thermal underwear set. Designed as a perfect winter base layer, it provides excellent insulation for outdoor play, school, or layering under everyday clothes in chilly weather.
  • Soft cotton fabric: Made from 100% cotton (Marl Grey: 88% cotton, 12% polyester), this kids thermal set ensures gentle warmth while allowing the skin to breathe. Ideal for sensitive skin, keeping your little one dry, fresh, and warm throughout winter activities.
  • Flexible fit: Crafted with stretchable fabric that moves with the body, this girl's long sleeve top and bottom set provides full comfort during play or sleep. The lightweight base layer maintains warmth without feeling bulky under clothing.
  • Sizes and colours: Choose from 3–5, 6–8, 9–11, and 12–13 years to find the perfect fit for your child. Available in classic Black, White, and Marl Grey\u2014ideal for layering, skiing, hiking, or wearing as daily winter thermal clothing.
Heatwave Thermalwear Girls Thermal Underwear Set Long Sleeve Top and Bottom Pants Winter Base Layer for Kids Warm Cold Weather, Marl Grey 12-13 Years
£7.95
Last change: 2025-11-18
SKU: B0FX4PS4LY

INSAFIANS Kids Thermal Long Johns Set Base Layer Sports Gym Underwear Long Sleeve Top Bottom Compression Set Athletic (Black, Set 9-11 Years)

  • Premium Quality Fabric: Engineered for maximum warmth and comfort, perfect for chilly weather conditions.
  • Effective Heat Retention: Designed to trap warm air close to the body, making it ideal for winter outings and active play.
  • Luxurious Softness: Crafted from a cozy blend of 50% cotton and 50% polyester, featuring a lightly brushed interior for all-day comfort.
  • Stylish Versatility: Available in classic black and grey for ages 3 to 13, with options to purchase the long sleeve top, bottoms, or complete set individually.
  • Convenient Care: Machine washable for easy maintenance and long-lasting wear.
INSAFIANS Kids Thermal Long Johns Set Base Layer Sports Gym Underwear Long Sleeve Top Bottom Compression Set Athletic (Black, Set 9-11 Years)
£8.99
Last change: 2025-11-18
SKU: B0DLWKTN1Z

GA COMMUNICATIONS KIDS THERMAL WINTER WARM UNDERWEAR FULL SET LONG JOHN BOTTOM AND LONG SLEEVE TOP[Black,9-10

  • UNISEX THERMAL FULL SET: The long sleeve thermal shirt and pants for boys and girls are good to wear at home or as a base layer undercoats, it also can be a comfy suit on cold nights. The compression sets fit improves blood flow and oxygen supply which maintains its shape even after repeated washing.
  • MOISTURE WICKING COMPRESSION FIT: The moisture management system wicks perspiration and dries quickly. It will give protection for kid's skin, and joints with less risk of rash, overheating or muscle fatigue in athletic activities. These boys and girls compression shirts and pants keep cold air away from children body and not lose away.
  • WINTER WARM FABRIC: Winter warm underwear is designed for extra warmth and comfort. Made of 50% polyester, 50% cotton blend skin-touch fabric, our kid's thermal wear in normal thickness is lightweight, keeps your kids warm without feeling bulky.
  • SUITABLE FOR ALL SEASONS: These long john bottoms with long sleeve tops are best used as a base layer under your child's clothing in cold to very cold weather and medium to high activity levels. Your kids can wear it for active sports like baseball, basketball, soccer, football, squat, weight training, cycle, yoga, skiing, snowboarding and all-weather sports.
  • FOUR-WAY STRETCHABLE: The athletic tights with full sleeves are designed with four-way stretch fabric for your kid's freedom of activities, really slim and light without bound feeling, allowing kids to bend, stretch, jump and run freely. The base layer sets allow greater mobility in any direction.
GA COMMUNICATIONS KIDS THERMAL WINTER WARM UNDERWEAR FULL SET LONG JOHN BOTTOM AND LONG SLEEVE TOP[Black,9-10
£6.99 - £8.29
Last change: 2025-11-18
SKU: B08HMB75C4

Heatwave Pack of 2 Boys Thermal Trousers Long Johns Black Winter Warm Underwear Baselayer Camping Ski Pants School wear, 6-8 Years Black

  • HEATWAVE offers a comprehensive range of essential items, including t-shirts, long sleeves, long johns, trousers, and bedding products, designed with premium materials and superior craftsmanship, ensuring optimal comfort, style, and performance for all your indoor and outdoor needs.
  • QUALITY: Boys long john crafted from 50% cotton and 50% polyester. With a TOG rating of 0.45, this set ensures excellent insulation, keeping you cozy in cold weather, and making it an ideal choice for indoor and outdoor activities.
  • KEEP WARM AND DRY: Boys long john include moisture-wicking fabric to keep you dry and warm in temperatures below 30°F (0°C). They also feature a fleece inside to keep you warm and cosy.
  • It is ideal for those who enjoy outdoor and winter sports including hiking, camping, skiing, and snowboarding. Since the elastic seams are flexible and won't bunch up or fall down during daily activities.
  • Size Instruction: Our Boys' long johns cater to various ages: 3-5 Years, 6-8 Years, 9-11 Years, 12-13 Years, and 14-15 Years. This range ensures a cozy fit at every stage of childhood and adolescence. Utilize our size guide to find the right fit for unrestricted movement and lasting comfort.
Heatwave Pack of 2 Boys Thermal Trousers Long Johns Black Winter Warm Underwear Baselayer Camping Ski Pants School wear, 6-8 Years Black
£9.95
Last change: 2025-11-18
SKU: B0CGR4J31P

AKKQHH Kids Thermal Base Layer Set Winter Underwear Skins for Boys Long Sleeve Top and Long Johns Bottoms Suit Black

  • WARM AND LIGHTWEIGHT:This kids thermal base layer set includes long-sleeves tops and elastic waist leggings,lightweight and warm,keep your child warmer in winter,sweat-wicking and breathable,wicks away perspiration and keeps skin dry after your child sweats.
  • LIKE SKIN:Our kids winter thermal underwear set fits your child's body like skin,soft and comfortable,perfect for your child's delicate skin,reduces static electricity damage in winter,no constraints for movement,very flexible,allowing your child to move freely.
  • SUITABLE FOR ALL SPORTS:This thermal trouser and thermal top has a stretchy and wrapping fabric,great to wear in winter when your child is outdoor activities,such as football,skating,skiing,running,biking,outdoor trips,going to school,give your child a warm outdoor experience.
  • Wear Under Any Clothes:Our boys thermal full set can be used as an inner layer of any winter clothes,your kid can wear it as an inner layer under coats,down jackets,sweaters,sweatshirts,and also as a loungewear at home,adding a layer of defense against winter cold for your child.
  • MULTIPLE SIZES AVAILABLE:This kid's thermal underwear set covers the age range of 6-13 years old,available in black and navy,the color is low-key and not ostentatious,for the sizes,please refer to the size charts or the detail page.
AKKQHH Kids Thermal Base Layer Set Winter Underwear Skins for Boys Long Sleeve Top and Long Johns Bottoms Suit Black
by AKKQHH
£9.99
Last change: 2025-11-18
SKU: B0FGXL75PR

Kids Thermal Underwear Skins Set Long Sleeve Top Vest and Long Johns Leggings, Boys Girls Base Layer, Football, Sports, Ski Black

  • Children's Extreme Ultralight Warmest Top and Tights Sets make all favorite cold weather activities more pleasant. Whether snowboarding; skiing; camping or other outdoor sports; traveling and even sleeping Outland Thermal set keeps your kids comfortable.
  • The Thin Lightweight Thermal Clothing maintains body heat at a cool temperature by wicking moisture away from the skin; drying quickly and insulating from the cold.
  • The Basic Boy and Girl Underwear Undershirt and Bottom Leggings have an interior microfiber fleece that is soft and cozy; feels great against your skin and under a layer of clothing
  • We have your size! For babies, toddlers, youth; juniors; teens; boys, and girls from 2-4 to 14-16. Several solid color options, including a tactical camo shirt and our new HEATHER GREY.
  • Does not restrict movement; feels like a second skin with four-way stretch and gives your kids the needed warmth without thick or heavy layers. The suit Kids Underwear long johns can be repeatedly washed without shrinking. Machine wash dries quickly.
Kids Thermal Underwear Skins Set Long Sleeve Top Vest and Long Johns Leggings, Boys Girls Base Layer, Football, Sports, Ski Black
£15.99
Last change: 2025-09-12
SKU: B073YF4S4N

Kids Thermal Winter Warm Underwear Set Long John Bottom and Short Sleeve Top Size:Age 3-5 Years (Unisex Boy Girl Children) Colour:Charcoal Grey

  • Official BRITWEAR Branded Thermal Underwear
  • If it does not say BRITWEAR on the inside label then it is not a BRITWEAR
  • Protected by the BRITWEAR 101 Day Guarantee
Kids Thermal Winter Warm Underwear Set Long John Bottom and Short Sleeve Top Size:Age 3-5 Years (Unisex Boy Girl Children) Colour:Charcoal Grey
£6.95
Last change: 2025-09-12
SKU: B00AN656W8

Zando Kids Thermal Base Layer Set 2-6 Years, Kids Boys Black Thermal Tights Leggings, Boys Clothes, Black, 3-4 Years

  • MATERIAL DESCRIPTION: This children's thermal underwear is made of 62% acrylic, 28% viscose, 10% spandex composition, wear-resistant, no pilling, no fading, no deformation, no adverse effects on your child's delicate skin, well-made.
  • UNIQUE DESIGN: The top of this kids suit is a round neck pullover design, and the trousers are just to ankle length, guaranteeing your child's warmth in spring and autumn seasons, and can also be worn as an inner layer in winter.
  • COLOUR MATCHING CHOICE: This children's thermal underwear has five colour matching options: black, white, navy, light grey, light pink, classic four neutral colours to meet the needs of most children, light pink is very sweet and cute.
  • SIZE CHOICE: This children's thermal underwear has three sizes to choose from: 90 (for 2-3 year olds), 100 (for 3-4 year olds), 110 (for 4-5 year olds), 120 (for 5-6 year olds), please choose the most suitable size for your child according to his/her age and the size chart.
  • WEARING OCCASION: This kids' thermal underwear is perfect for student wear, casual wear, sportswear, loungewear or outdoor wear in winter, spring, autumn, etc. It is one of the must-have items for your child's daily wear.
Zando Kids Thermal Base Layer Set 2-6 Years, Kids Boys Black Thermal Tights Leggings, Boys Clothes, Black, 3-4 Years
by Zando
£12.79
Last change: 2025-09-12
SKU: B0DLWF4LPF

Heat Stoke Kids Thermal Skins Set Long Sleeve Top and Long Johns Leggings, Boys Girls Base Layer. (CHARCOAL, 14-15Years)

  • Heat Stoke Pack of 1 Kids Thermal Skins Set Long Sleeve Top and Long Johns Leggings, Boys Girls Base Layer.
  • Made Of 50% Cotton And 50% Polyester Soft And Breathable, Moisture-wicking Fabric Can Wick Sweat From Your Child's Body, Then Dry Fast, Keep Your Kids Dry And Comfortable All Day When Football Practices And Games.
  • Children's Extreme Ultralight Warmest Top And Thermal Sets Make All Favorite Cold Weather Activities More Pleasant. Whether Snowboarding; Skiing; Camping Or Other Outdoor Sports; Traveling And Even Sleeping Outland Thermal Set Keeps Your Kids Comfortable.
  • The Basic Boy And Girl Underwear Undershirt And Bottom Leggings Have An Interior Microfiber Fleece That Is Soft And Cozy; And Feels Great Against Your Skin And Under A Layer Of Clothing.
  • The Boys' Base Layer Consists Of A Sleeve Top And Bottoms With An Elastic Waistband. It Is Super Light, And Comfy has Excellent Warm-keeping Performance, And Has A Windproof Function In Cold Weather. The Unisex Thermal Set Will Bunch Around Your Children's Waistline Or Sleeves And Reduce Heat Loss.
  • Moisture Wicking And Quick Dry The Kid's Long Thermal Set Is Breathable And Has A Moisture-wicking System, The Bottom Layer Draws Moisture Away From The Skin After Sweating, Dries Quickly, And Isolates The Cold. Keeping The Skin Dry Will Give Your Child A Better Wearing Experience And No Special Smell.
  • Washing Instructions Machine Washable At 40°C, Can Be Tumble Dried, Wash Dark Colors Separately.
Heat Stoke Kids Thermal Skins Set Long Sleeve Top and Long Johns Leggings, Boys Girls Base Layer. (CHARCOAL, 14-15Years)
£7.99
Last change: 2025-09-12
SKU: B0D4283GSF

BUYKUD Kids' Boys Fleece Warm Thermal Underwear Long Sleeve Base Layer Compression Athletic Shirt Tights Top & Bottom Set Unisex, Fleece/Black, 12-13 Years

  • 92%Polyester,8%spandex,Thermals, Fleece Warm
  • Extremely smooth and soft polyester and elastane fabric ensures a pleasant and supple touch without irritation even with prolonged wear
  • Helping compress the core muscle area to prevent muscle soreness caused by lactic acid accumulation,protect knee ligaments and promote skeletal muscle growth,quickly achieve the desired athletics effect
  • Pants feet reflective strip design to help children improve visibility at night and protect kids safety ,abrasion-resistant, moisture wicking, fast drying fabric,anti-odour technology prevents the growth of odour-causing microbe
  • Great for weight training, football, rugby, skiing, snowboarding and all sports activities including walking & running, and is even ideal as a base layer for motorcyclists and those who work outdoors
BUYKUD Kids' Boys Fleece Warm Thermal Underwear Long Sleeve Base Layer Compression Athletic Shirt Tights Top & Bottom Set Unisex, Fleece/Black, 12-13 Years
by BUYKUD
£18.99
Last change: 2025-09-12
SKU: B07ZYV54LR

SOHOBABY Pack Of TWO Kids Black Thermal Underwear Heat Preserve Long Johns Trousers Set (11-13 years)

  • Pack Of TWO Kids Black Thermal Underwear Heat Preserve Long Johns Trousers Set
  • Available in the following sizes: 3-5 years, 6-8 years, 9-11 years and 11-13 years
  • These Thermal Sets will keep your little one Warm all winter long, Perfect for wearing under everyday clothes. Designed to maintain Body Temperature and Protect you from the Cold, these set keep your Body Heat in, making you less likely to get Cold
  • This Boys thermal underwear features heat trap technology with brushed fibres inside for extra warmth, softness and optimum comfort, which has been carefully manufactured with fabric which has been knitted on a circular knitting machine so having near seam free for extra comfort.
  • The Breathable stretch material makes for an extremely Comfortable Fit. Thermals can be worn every day under school uniforms P.E kits and for outdoor sports such as football, running or skiing.
  • Machine washable at 30 degrees
SOHOBABY Pack Of TWO Kids Black Thermal Underwear Heat Preserve Long Johns Trousers Set (11-13 years)
£6.95
Last change: 2025-09-12
SKU: B0CNQD6RK7
2X Unisex Children Girls Boys Kids Thermal Underwear Short Sleeve Warm Vest (7-8 Year, White)
by SOFTY
£10.99
Last change: 2025-09-12
SKU: B07FP198NB

Stolpyzh Kids' Boys Base Layer Set Long Sleeve Thermal Sports Underwear Gym Athletic Shirt Tights Top & Bottom Sets (Long Black, 8-9 Years/size 26)

  • 92%Polyester,8%spandex
  • Four-way Stretch Fabric: Skin Compression Fit Support and wrap athletic muscle groups, reducing the risk of injury and aiding blood circulation
  • Quick Dry & Moisture-Wicking: quick-drying, moisture-wicking fabrics,the bottom layer draws moisture away from the skin after sweating, dries quickly, and isolates the cold. Keeping the skin dry will give your child a better wearing experience.
  • Perfect for Many Occasion: Boys underwear set great for weight training, running, football or basketball sports. As well as winter pajamas and base shirts.
  • Comfortable: This boy's thermal underwear set is ultra soft, comfy, with a seamless inner layer, perfect for children's delicate skin. Suitable as a first layer for daily life like comfortable pajamas on nights, or as thermal underwear for outdoor activities in cold weather.
Stolpyzh Kids' Boys Base Layer Set Long Sleeve Thermal Sports Underwear Gym Athletic Shirt Tights Top & Bottom Sets (Long Black, 8-9 Years/size 26)
£8.66
Last change: 2025-09-12
SKU: B0CPT35HP5

MeetHoo Thermal Underwear Kids, Boy's Long Sleeve Base Layer Compression Warm Underwear Set Bottom&Tops Fleece Lined for Kids (8-16 Years) XS/125-135cm

  • 【ULTRA SOFT & WARM FABRIC】Our boys thermal underwear set is designed for comfort with fleece lined, in normal thickness will keep children's body in a comfortable temperature, add warmth and reduce heat loss. The kids thermal underwear set is available in age 8-16 years, suitable for height 125-175CM and weight of 27kg-60kg children.
  • 【 FULL MOBILITY AND FREEDOM OF MOVEMENT】Our kid's long underwear is made of 92% Polyester + 8% Spandex, with elastic waistband, highly elastic fabric, four-way stretch design that enhances your child's range of motion and allows them to move freely in any direction, abrasion-resistant, comfortable, lightweight,the Fleece Lined Long Johns Set for kids works excellently during their winter outdoor activities.
  • 【 MOISTURE WICKING 】Perfect combination of warmth and breathability, When your kids sweat, thermal Underwear for Boys can wick moisture away from his skin, and dry quickly and insulating from the cold, against unpleasant smell caused by sweat.
  • 【SUITABLE FOR INDOOR OR OUTDOOR WEAR】Thermal Set for Kids can be use underneath clothing or for a day out, boy's long johns thermal sets can be worn as comfy pajamas on cold, chilly nights. 2 Pcs kid's thermal underwear set(Top & Bottom) Perfect for your son during the cold winters, school, ski or snow holidays, camping, pyjamas, hiking, outdoor trips etc.
  • 【100% SATISFACTION GUARANTEED 】Any problem with our MeetHoo boys thermal underwear set, Please feel free to contact us, we will try our best to help you ASAP, you can get a 30 days warranty (can be returned or exchanged)or 100% money back, if you are unsatisfied on this item for any reason.(Please refer to the size chart carefully).
MeetHoo Thermal Underwear Kids, Boy's Long Sleeve Base Layer Compression Warm Underwear Set Bottom&Tops Fleece Lined for Kids (8-16 Years) XS/125-135cm
£17.59 - £24.65
Last change: 2025-09-12
SKU: B082VVB3P2

Published date: 2023-01-17 16:18:05

The Boot Kidz by Karen Henry. Bootkidz Ltd (Company No. 06581865), a private limited company registered in England and Wales. Established 2005. Based in London, UK. Contact: karen@bootkidz.co.uk
Official homepage: https://www.bootkidz.co.uk
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