Shop Baselayer Collection on the Under Armour official website. Find baselayer collection built to make you better — FREE shipping available in the USA.

Shop Baselayer on the Under Armour official website. Find baselayer built to make you better — FREE shipping available in the USA.

UA builds men’s baselayer shirts, pants, leggings, tights, and performance thermals to help you take on any weather so you can put in the work year round. When it’s hot out, lightweight HeatGear® keep you cool. ColdGear® and UA Base keep you warm, but wick sweat as you work so you won’t overheat.

Shop Mens Baselayer Collection - Leggings on the Under Armour official website. Find baselayer collection built to make you better — FREE shipping available in the USA.

Shop UA Men's Baselayer on the Under Armour official website. Find men's baselayer collection built to make you better — FREE shipping available in the USA.

Shop Baselayer Collection - Leggings on the Under Armour official website. Find baselayer collection built to make you better — FREE shipping available in the USA.

UA Base 4.0 is a men's baselayer built for extreme cold weather and lower activity. It uses a unique pattern that's designed to trap heat without adding bulk. Think long underwear, revamped for today's top athletes.

UA Base 3.0 is built for very cold weather and moderate activity. It uses a unique pattern that's designed to trap heat without adding bulk. Think long underwear, revamped for today's top athletes.

Shop Womens Baselayer Collection on the Under Armour official website. Find baselayer collection built to make you better — FREE shipping available in the USA.

Shop Mens UA ColdGear® on the Under Armour official website. Find cold weather clothing and gear built to make you better — FREE shipping available in the USA.