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 Your Workout Is My Warm up funny shirt to wear at the gym. Perfect gift for birthday, christmas, holiday or graduation for the fitness enthusiast in your family. My warmup is your workout tshirt is great for girls or boys to wear to their next workout at the gym or park! If you can load up the squat rack or benchpress with tons of weight then this is your shirt! Lightweight, Classic fit, Double-needle sleeve and bottom hem