The Under Armour Women's ColdGear 1/2 Zip Shirt can be used as a warm base layer in cold weather, midlayer in the warmer spring outings, or a great wear alone piece for workouts and activities in any temperature. UA evo coldgear infrared fabric transports moisture to keep you dry and traps heat to keep you warm. It has UA's patented Cold Gear Infrared printed interior which helps keep you warmer longer. Flatlock seams make it more comfortable and creates less chafing. This piece has a stretch to it that allows for free movement and longer wearing.