Baselayer Tops

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.

HeatGear Armour is UA's original performance baselayer - the one you put on first and take off last. So they made it extra comfortable by wicking sweat and stretching so you can move no matter what.

HeatGear Armour is our original performance baselayer - the one you put on first and take off last. So UA made it extra comfortable by wicking sweat and stretching so you can move. No athlete can go without it.

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.

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.

Made in the USA, Elbeco's UFX Base Layers are the perfect undergarment for the Occupational Athlete's everyday uniform needs. This performance polyester knit features Elbeco's Antimicrobial and Nano Moisture Wicking technologies to reduce odor causing...

Worn under a vest carrier, the UV2 provides a clean and professional appearance. Expanding on our successful UV1 series, the UV2 FlexTech offers warmth without bulk when worn under vest carriers. The UV2 FlexTech provides exceptional comfort, mobility,...

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 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.

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.