Craft Sportswear Women's Active Extreme 2.0 Long Sleeve Tight Fitted Base Layer Shirt 100% Other Fibers Imported Tight fitting top Thin, lightweight and elastic fabric that is channel-knitted to trap air and provide warmth Coloma-Air fiber against the skin enhances cooling and moisture transport Body mapped mesh for optimal temperature regulation Flatlock seams that follow body movements Craft is the official apparel and footwear sponsor of Spartan Race