Duofold by Champion Thermals Women's Base-Layer Shirt_Winter White_Small. Outdoors or in, wear this base-layer shirt to chase away the chill. It's your everyday thermal underwear, ideal for low activity levels. , Soft, pretty pointelle knit traps air between two thermal layers. Result: a chill-blocking barrier that keeps you comfortably warm, Sleek feminine fit allows for easy layering, Tag free for itch-free comfort, with non-chafe flat-locked seams.