Under Armour® UA BaseTM 4.0 Base Layers are built for comfort during the coldest conditions or low activity. They're moisture wicking and fast drying to keep you light and comfortable. They significantly reduce odor-causing bacteria to limit your scent. But paramount to their design is a soft grid interior that holds your body heat to keep you warm. All in a fitted style with 4-way stretch so they fit easily under your gear and move as you do. Wear for hunting, athletics, or winter exploring.