I Do My Own Stunts Mountain Bike Shirt - Funny MTB T-Shirt 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 I Do My Own Stunts Shirt Funny Mountain Bike T-Shirt Gifts, MTB Funny Shirt Funny Mountain Bike Shirts, Humor Mountain Biker Shirt, Funny MTB Shirt Gift Lightweight, Classic fit, Double-needle sleeve and bottom hem