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. DNASpecsFit & Care UA Base™ 2.0 Active Baselayer is lightweight, flexible & breathable for high activity in cool conditions Soft, brushed grid interior traps air, managing your body's microclimate to keep you warm & comfortable Material wicks sweat & dries really fast 4-way stretch material moves better in every direction Performance elastic waistband ColdGear BNIB Large Black