Muscle Shirt T-Shirt - Everyday I'm Musclin' Solid colors: 100% Cotton; Heather Grey: 90% Cotton, 10% Polyester; All Other Heathers: 50% Cotton, 50% Polyester Imported Machine wash cold with like colors, dry low heat Cool Colors and Comfortable Fit Show off those muscles at the gym or at the house Lightweight, Classic fit, Double-needle sleeve and bottom hem