Sugoi Men&#39;s Piston 140 Short Sleeve Tee Body:76% Nylon 24% Spandex, Mesh:75% Nylon 25% Spandex; cool wash, no bleach, no dry, no iron, no dry clean Raglan sleeve and flat seems for increased comfort Smart Seams to increase movement and reduce abrasion Ergo Sleeve contours for natural unrestricted body movement Canada