Best Boys' Thermal Underwear Sets

Most Comprehensive

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

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.

Thermal Underwear Set for Boys

Sizing may run large.

Best Bang for the Buck

ViCherub

Comfy Value

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

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.

Boys' Premium Thermal Waffle Underwear Set

May need to size up for taller kids.

Fruit of the Loom

Trusted Brand

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

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.

Seams may be lacking in durability.

Polyester and spandex thermal underwear with a warm lining.

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.

Boys' Thermal Underwear Set

Sizing may be inconsistent.

Thermajohn

Feature-Packed

Thermal underwear set with various elements for comfort and performance.

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.