Push past your limits. The Mission VaporActive Alpha Sleeveless T-Shirt is your indispensable, go to, year-round shirt for training and running. Flatlock stitching for zero chafing. UPF 20. Next-level VaporActive technology, powered by 37.5, attracts moisture at the vapor level and rapidly removes sweat, keeping you cool, dry and comfortable. The permanent technology embedded at the fiber level is chemical free, controls odor and is engineered to never degrade or wash out. Machine wash cold with like colors. Only non-chlorine bleach when needed. Do not use softeners. Tumble dry low. Do not iron.