Base Layer

What's it do? UA Base 2.0 is built for cold weather and high activity levels. 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™ 2.0 Active Baselayer is...

We all hate it. That stiff, distracted feeling you get when you're out in the cold. That's why, we built a baselayer that keeps you warm and dry without being bulky or riding up, so you can stay focused all season long. Dual-layer fabric with an...

We all hate it. That stiff, distracted feeling you get when you're out in the cold. That's why, we built a baselayer that keeps you warm and dry without being bulky or riding up, so you can stay focused all season long. Dual-layer fabric with an...

We all hate it. That stiff, distracted feeling you get when you're out in the cold. That's why, we built a baselayer that keeps you warm and dry without being bulky or riding up, so you can stay focused all season long. Dual-layer fabric with an...

We all hate it. That stiff, distracted feeling you get when you're out in the cold. That's why, we built a baselayer that keeps you warm and dry without being bulky or riding up, so you can stay focused all season long. Dual-layer fabric with an...

What's it do? 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™...

87% Polyester, 13% Elastane Imported Pull On closure Dual-layer fabric with an ultra-warm, brushed interior & a smooth, fast-drying exterior Stretch-mesh gusset & inseam panels provide strategic ventilation 4-way stretch construction moves...