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.
We're 16 Years Strong - Thanks to Ya'll! We're tipping our hats & kicking up our boots in celebration - 16 YEARS IN BUSINESS, & it's all because of the incredible support from our customers, friends, & community! Here's to 16 years of grit, good boots, & great customers! Thank you for riding with us!