Product Features: 100% polyester. A slim fit works together with moisture-wicking fabric to help keep sweat off your skin when your training heats up. Dri-FIT technology moves sweat from your skin for quicker evaporation—helping you stay dry and comfortable. Invisible Thumb Loops help hold the sleeves in place as you move—and remain hidden when not in use. Longer back hem helps keep you covered. 1/4 zipper. Slim fit for a tailored feel. Machine wash.