KEEP COOL: Nike Dri-FIT technology moves sweat away from your skin for quicker evaporation, helping you stay dry and comfortable. STAY-PUT FIT: 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 Body: 91% polyester/9% spandex. Panels: 94% polyester/6% spandex.