UA Base 4.0 is 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. UA Base 4.0 Extreme Baselayer is our warmest yet, delivering extreme warmth in the extreme coldUA 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 construction moves better in every directionWide, flat waistband with a rise that sits just right on your hips Under Armour Women's ColdGear Base Legging 4.0 Black/Pitch Gray 1343323-001, XS