UA Base 2.0 Active Baselayer is lightweight, flexible and breathable for high activity in cool conditions; UA Scent Control Technology to keep you undetected in all pursuits; Soft, brushed grid interior traps air, managing your body's microclimate to keep you warm and comfortable; Material wicks sweat and dries really fast; 4-way stretch material moves better in every direction; Wide, flat waistband with a rise that sits just right on your hips