Midweight (180g/㎡): 90% Ultra-Soft Polyester, 10% Spandex.

Soft brushed fabric next to the skin provides warmth, breathability and moisture-wicking performance.

Four-way stretch fabric delivers a flexible range of motion, great for any outdoor activity, adventure or even workouts.

Smooth flatlock seams and tagless labels minimize chafing and provide next-to-skin softness and chafe-free comfort.

Raglan sleeves remove top shoulder seams, reduce chafing and increases comfort under your pack straps.

Willit men's long sleeve underwear shirts are great to wear at home or add an extra layer of warmth under your outdoor gears in extreme cold weather. Matching bottoms are available but sold separately.

Willit Men's Thermal Underwear Pants Long Johns Bottoms Fleece Lined Base Layer Leggings