Baselayer

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.

The Phase 1 Boxer Briefs from XGO are made from a blend of Modacrylic and FR Rayon that meets the ASTM D6413 Standard. These boxer briefs will not melt or drip if exposed to flame. These briefs also feature XGO's Superior Acclimate that will wick...

UA Base 4.0 is 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.

ColdGear Infrared technology holds in body heat, without adding weight or bulk. It's a special, soft print on the inside and it keeps you warmer, longer, so you can work out in the bitter cold.

UA made an all-over mesh version of their UA Tech Boxerjock to bump the ventilation up a few notches. These are performance boxer briefs for working out.

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

Good underwear goes unnoticed. Super-soft laser-cut edges offer a smooth, virtually invisible fit under everything from a pair of run shorts to UA's most body- hugging compression leggings.

UA made an all-over mesh version of their UA Tech Boxerjock to bump the ventilation up a few notches. These are performance boxer briefs for working out.