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BestReviews spends thousands of hours researching, analyzing, and testing products to recommend the best picks for most consumers. We only make money if you purchase a product through our links, and all opinions about the products are our own. Read more  
BestReviews spends thousands of hours researching, analyzing, and testing products to recommend the best picks for most consumers. We only make money if you purchase a product through our links, and all opinions about the products are our own. Read more  
BestReviews spends thousands of hours researching, analyzing, and testing products to recommend the best picks for most consumers. We buy all products with our own funds, and we never accept free products from manufacturers.Read more 
Bottom line
Pros
Cons
Best of the Best
Rocky Thermal Underwear for Boys
Rocky
Thermal Underwear for Boys
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Most Comprehensive
Bottom Line

A high-quality thermal underwear set with a fleece lining that earns our fitness expert's approval.

Pros

Soft polyester and spandex thermal long-sleeve top and pants. Lined with lightweight fleece. Moisture-resistant and designed for easier bathroom trips. Features stretchy seams. Machine-washable. Comes in different colors.

Cons

Sizing may run large.

Best Bang for the Buck
ViCherub Thermal Underwear Set for Boys
ViCherub
Thermal Underwear Set for Boys
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Comfy Value
Bottom Line

A pair of comfy, stretchy, warm thermal sets that earns a spot in our expert’s top picks.

Pros

Made of polyester microfiber and spandex for warmth and freedom of movement. Designed to resist shrinkage. Wicks sweat. Fits well under clothing for fall or winter. Can also be used as pajamas. Two sets included.

Cons

May need to size up for taller kids.

Fruit of the Loom Boys' Premium Thermal Waffle Underwear Set
Fruit of the Loom
Boys' Premium Thermal Waffle Underwear Set
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Trusted Brand
Bottom Line

A pack of thermal underwear with stretchy fitted cuffs to keep sleeves and pants in place.

Pros

Crew-neck long-sleeve top and pants with soft, oversized cuffs. Made of cotton and recycled polyester. Machine-washable. Pants pull on and have features that make bathroom trips easier. Mini waffle-knit material.

Cons

Seams may be lacking in durability.

DEVOPS Long Johns Set
DEVOPS
Long Johns Set
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Most Flexible
Bottom Line

Polyester and spandex thermal underwear with a warm lining.

Pros

Soft crew-neck long-sleeve top and pants. Thermal fleece lining; made of 90% polyester and 10% spandex. Form-fitting with stretch. Dries fast and is moisture-resistant. Maintains body heat. Easy to layer under clothing.

Cons

Sizing may be inconsistent.

Thermajohn Boys' Thermal Underwear Set
Thermajohn
Boys' Thermal Underwear Set
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Feature-Packed
Bottom Line

Thermal underwear set with various elements for comfort and performance.

Pros

Crew-neck long-sleeve top and pants with an elastic waistband. Made with 92% polyester and 8% spandex and is machine-washable. Lined with brushed fleece. Wicks away moisture and prevents odor. Fly for bathroom use.

Cons

Sizing may be inconsistent.

HOW WE TESTED

We recommend these products based on an intensive research process that's designed to cut through the noise and find the top products in this space. Guided by experts, we spend hours looking into the factors that matter, to bring you these selections.

30
Models
Considered
160
Consumers
Consulted
24
Hours
Researched
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Our Top Picks