Product Features: 100% polyester. A relaxed, easy 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. Standard fit for a relaxed, easy feel. Machine wash.