When you want to let it rip, the Arc'teryx Norvan women's long-sleeved running shirt will push the pace with sweat-wicking superpowers. Designed specifically for fast and light running with ultra-breathable mesh under the arms and on the back, the Norvan regulates your temperature without extra bulk or distraction. It is built to wear under a run vest, so there’s no pack chafe to slow you down.