These aren’t your grandpa's long underwear. The patented negative grid traps ridiculous warmth without adding excess weight. Lighter UA Base™ 2.0 and heavier UA Base™ 3.0 are strategically placed, so you get more wamrth where you need it. And less fabric where you don’t. This means you’ll never overheat, even when you’re working your hardest.
Heavier UA Base™ 3.0 is built for major warmth, and placed right where you need it
UA Base™ 2.0 is warm, but lighter and delivers added breathability where you run hot
Soft, brushed negative grid interior traps hot air, providing superior warmth
4-way stretch fabrication allows greater mobility and maintains shape