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. UA Base 2.0 Active Baselayer is lightweight, flexible & breathable for high activity in cool conditionsUA Scent Control Technology to keep you undetected in all pursuitsSoft, brushed grid interior traps air, managing your body's microclimate to keep you warm & comfortableMaterial wicks sweat & dries really fast4-way stretch material moves better in every direction Under Armour Women's ColdGear Base Long Sleeve Crew Top 2.0 Black/Pitch Gray 1343321-001 Top, Small