Baleaf Women's Running T-Shirts Short Sleeve Shirt 90% Polyester / 10% Spandex Imported Polyester fabric wicks moisture away from skin, dries quickly and is soft to the touch while the spandex fabric ensures extra stretch and a perfect shape recovery for extreme freedom of movement Cool feeling fabric offers instant and prolonged cooling while hiking, running, working out Open mesh back panel increases ventilation for superior breathability Raglan sleeves allow arms full range of movement and eliminate shoulder seam chafing Reflective elements increase visibility in low-light conditions, flatseam construction minimizes irritation and chafing