Top 10 Best kids long underwear in 2026

Last Updated - 6/29/2026

🏆Best Choice

TELALEO

TELALEO Boys' Girls' Long Sleeve Compression Shirts Thermal Fleece Lined Kids Athletic Sports Tops Leggings Baselayer Set M

9.8

ChoiceComparer.com Score

9.8

/ 10

Outstanding

Main highlights

•85% Polyester / 15% Spandex (elastic fabric), Fleece Lined.
•Feature: TELALEO Boys long sleeve compression shirts use stretchy brushed inner fleece material,thick and thermal, keeps your children warm in cold winter days.
•Heat Retention fabric technology offers dry, comfortable wear.
•Smooth flat seams prevent chafing, while the durability is great.
•Perfect for soccer, baseball, ice hockey, basketball, snowboarding, running and other activities in cold weather days. Size Chart: XSmall=US Size 6-6X / Small=US Size 7-8 / Medium=US Size 10-12 / Large=US Size 14-16 / X-Large=US Size 18-20.

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$19.99

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Rocky

Rocky Thermal Underwear Kids Girls Thermal Underwear Set Toddler Long Johns kid Thermals Kid Base Layer kids thermals top bottom set Winter Clothes Shirt Pants Ski/Extreme Cold (Lavender, XS)

9.7

ChoiceComparer.com Score

9.7

/ 10

Outstanding

Main highlights

•THERMAL UNDERWEAR KIDS: STAY-PUT DESIGN: Oversized jackets? Check. Bulky sweaters? Double check. Cargo pants loaded with all the essentials? Yup, even them. No matter how heavy your outer layers are, our thermals for kids base layers for cold weather/skiing stay put under even the heaviest loads.
•KEEP WARM AND DRY: Ultra soft fleece lined thermals for kids combined with moisture-wicking power can only mean one thing: Your little one is wearing a pair of Rocky youth thermal set underwear. No more sweaty, shivering nights — just warm, toasty goodness that wraps you in whole body comfort.
•ALL-DAY COMFORT: From morning jogs in freezing temps to chilly winter nights, our underoos children thermal underwear set are designed to keep you comfortable and warm all day long. With our fleece base layer kids for cold weather soft fabric that’s lightweight yet warm, it’s the kids underwear girls love.
•EASY TO CLEAN: A few wash cycles, and your long johns are toast. At least, inferior waffle-knit thermal tights are. Not with Rocky winter undies! Our thermal wear for girls are made from durable poly-spandex and superior stitching, washing machines are no match for their tough-as-nails construction.
•THERMALS KIDS LOVE: “Mooooom! They’re SO itchy!” Four words you’ll never hear your little one utter in a pair of Rocky thermal wear for kids warmer thermals girls underwear. With fleecy-soft comfort and a no-ride design, your little one will be nothing but cozy and content.

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$26.99

$29.99

-10%

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Amazon Essentials

Amazon Essentials Boys' Thermal Long Underwear Set, Black, X-Large

9.5

ChoiceComparer.com Score

9.5

/ 10

Outstanding

Main highlights

•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. Full-length pants feature front pouch and double layer keyhole fly. Ribbed cuffs at sleeves and leg openings.

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$14.30

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American Trends

Girls Underwear Kids Thermal Underwears Toddler Winter Base Layer Long Johns Sets for Boys A Black Medium (90) /2T-3T

9.4

ChoiceComparer.com Score

9.4

/ 10

Excellent

Main highlights

•Material: The toddler thermal set is made of high-quality and highly elastic fabric, which is warm, lightweight, moisture-absorbent and sweat-wicking.It offers 4-way elasticity, conforms to the child's body curves, and provides no sense of restraint during movement.
•Design: Thermal Underwear for Kids,these thermal long Johns perfectly blend comfort, warmth, elasticity and moisture resistance.The simple design and a few basic colors are suitable for all winter clothes for girls and boys.Thermal underwear is durable and resistant to deformation.Even after multiple washes, it can still maintain its shape and prevent sagging or shrinking.
•Features: The Base Layer set adopts three-dimensional cutting, with a high-elasticity waist and cuffs, which can prevent the clothes from slipping or leaving marks on the body.The round neck design makes it convenient to pair with various outerwear.
•Base layers: Toddler winter clothes for boys girls, perfect for indoor/outdoor winter activities.For outdoor recreation activities, as run, ski，school，cycle in the cold, make sure to use the thermal underwear set for under your clothing to keep warm and cozy in freezing cold climates or bad weather.
•Kids winter clothes: Kids underwear set- Designed to keep you dry, this long-sleeved shirt and long pants are made to be wick away sweat and other moisture, this thermal underwear for kids set will do its activitiess no matter how active you are.Suitable for machine washing.

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$24.99

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Ewedoos

Ewedoos Thermal Underwear Set for Kids Thermals Top and Bottom Set Boys Long Johns Base Layer Thermal Set Black

9.2

ChoiceComparer.com Score

9.2

/ 10

Excellent

Main highlights

•Fleece-Lined Soft (Without bulk). Ewedoos thermal underwear for kids gives your kids a high-quality warmth thanks to our unique soft and thick fleece-lined lightweight fibers. Ewedoos long johns for kids keep you warm but not bulky. Bring it on, blizzards. Do your worst, polar vortexes
•Unique Neckline Shirts. Ensuring maximum protection for your kids - the collar has been widened, increasing extra coverage area for your kid's neck. To keep up with them on their adventures, our kids thermals top and bottom set also feature flat and unnoticeable seaming, reducing chafing over long sessions
•Functional Reflective Design. Ewedoos thermal underwear for kids features 2 unique Reflective details to improve your visibility during dawn or dusk. A perfect thermal clothing set for your boys and girls, for skiing on the slopes, winter hiking, hunting, softball game or simply lounging or sleeping
•All-weather Performance (Without sweaty mess). Airflow moves easily through the garment. The 15% spandex makes these boys thermal underwear set ultra-comfortably 4-way stretch, and the 85% polyester adds extra breathability & moisture-wicking to keep you comfortable and dry, so trips to the snow won't be ruined by constant uncomfortable sweating and overheating. Children can keep their love for sports and keep winning
•Gifts That Make Spirits Bright. Warm on the inside to keep your children going outside. Ewedoos kids thermals top and bottom set let children not be afraid of the winter and melt away distractions all year long. Great for Christmas, birthday and New Year gifts

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$19.99

$26.99

-26%

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Fruit of the Loom

Fruit of the Loom boys Premium Thermal Waffle Underwear Base Layer Set, Black, 7-Jun US

9.1

ChoiceComparer.com Score

9.1

/ 10

Excellent

Main highlights

•Long sleeve crew neck t-shirt and pant set with reinforced seam construction
•Soft mini waffle fabric made from U.S. sourced cotton and recycled polyester
•Wicks away moisture, dries fast, and retains heat
•Tagless collar and waistband
•Easy Care

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Cuddl Duds

Cuddl Duds Thermal Underwear for Kids - Boys Cold Weather Clothes Fleece Lined Thermal Set - Winter Base Layer Long Johns - Thermal Shirt Top and Leggings Pants 2-Piece Set for Boys - Black Small

8.9

ChoiceComparer.com Score

8.9

/ 10

Great

Main highlights

•COLD-WEATHER READY: Help your kids stay cozy in the cold with a brushed fleece inside and matte soft outside. Our 2-piece thermal set has moisture-wicking fabric that absorbs and evaporates moisture.
•SPANDEX STRETCH: This boys top and bottom set features a spandex stretch that provides flexible comfort for busy activities. They’ll feel snug and warm during chilly adventures.
•HEAD-TO-TOE PROTECTION: Our thermal underwear has 50+ protection from harmful UV rays. With a thumbhole sleeve top, modern rise leggings, and a functional fly, your boys will look and feel great all day and night.
•COMPLETE COMFORT: They’ll feel warm without the bulk with our stylish base layer sets. The tag-free label helps reduce irritation for a seamless, itch-free experience without distractions.
•Live in Layers: For 50+ years, Cuddl Duds has provided comfy thermal underwear. Our innovative technology helps you stay warm and look good doing it — because layering is a lifestyle.

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$27.99

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Rolimaka

Rolimaka Boys' Thermal Underwear Set kids Fleece Lined Leggings Pants Compression Long Johns Base Layer Top and Bottom M

8.8

ChoiceComparer.com Score

8.8

/ 10

Great

Main highlights

•Heat Retention: Our boys thermal underwear set is designed with fleece lining to effectively capture body heat, making it perfect for wearing as a base layer in cold autumn and winter seasons, always keeping warm in very cold weather.
•Elastic Fabric: The fabric of this thermal underwear set for kids adopts four-way stretch technology, which fits snugly without being tight. Whether playing in the snow or indoors, kids thermal set can provide just the right flexibility and warmth.
•Moisture Wicking: The fabric is composed of 85% Polyester,15% Spandex. This kids long underwear is quick drying, breathable, and moisture wicking, keeping children dry and comfortable during snow sports or cold school days. No more damp or smelly boys thermal base layer.
•Skin Friendly: This toddler thermal set features a design with fewer stitching lines, effectively reducing friction on the skin for both the thermals top and bottom set, providing the most skin friendly and comfortable experience for winter activities.
•Occasion: These winter clothing for kids include one thermal compression pant and one thermal shirt, making them perfect for skiing, basketball, soccer, hockey, baseball, outdoor activities in cold weather, as well as providing warmth indoors as pajamas.

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$14.99

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Fruit of the Loom

Fruit of the Loom girls Premium Thermal Waffle Underwear Base Layer Set, White/Fuchsia Burst, 14-16 US

8.6

ChoiceComparer.com Score

8.6

/ 10

Good

Main highlights

•Warm waffle long john thermal set for girls
•Soft mini waffle fabric made from U.S. sourced cotton and recycled polyester
•Long-sleeve crew-neck t-shirt and pant set with reinforced seam construction
•Wicks away moisture, dries fast, and retains heat
•Tagless collar and waistband

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$19.99

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Poekuao

Poekuao Thermal Underwear for Kids Thermals Top and Bottom Set Boys Soft Long Johns Fleece Lined Base Layer for Skiing Black

8.5

ChoiceComparer.com Score

8.5

/ 10

Good

Main highlights

•Practical Design: Thermal underwear for kids with thumb holes on the top for extra warmth, elastic waistband for easy on and off, and a functional fly for convenience
•Stretch & Warmth: Boys thermal underwear set made from 88% polyester and 12% spandex, featuring 4-way stretch outer fabric and fleece-lined interior for lasting warmth
•Soft & Moisture Wicking: Ultra soft breathable fabric wicks moisture to keep kids dry, fresh, and comfortable during indoor or outdoor activities
•Tagless Comfort: Kids long underwear features smooth flatlock seams and a tag free design to prevent chafing, reduce skin irritation, and provide all day comfort
•Multi Use Base Layer: Kids thermals top and bottom set perfect for home wear or as a winter sports base layer for skiing, ice skating, soccer, baseball, hockey, basketball, running, and more

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$21.99

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