Dickies Men's Sleeveless Performance T-Shirt Big 85% Polyester, 15% Cotton Imported Machine Wash Can reduce skin temperature by up to six degrees to help keep you cooler in hot temperatures Natural odor neutralizer with fresh guard, won't discolor with perspiration (no underarm stains) Comfortable soft and lightweight fabric No annoying static cling, resists wrinkles Tag less for comfort, flat-lock stitching ensures no chafing against the skin