Official Teenager 13 Thirteen Thirteenth Birthday Tshirt 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 Birthday Gift Tshirt 13 13th Teenager Tshirt. This is perfect for all of those birthday pictures! Official Teenager Tshirt 13th Birthday Tee Thirteenth Birthday Official 13th Birthday Tshirt Boy Girl Gift Tee Shirt. Official Teenager Tshirt 13th Birthday Tee Thirteenth Birthday Official 13th Birthday Tshirt Boy Girl Gift Tee Shirt 13 year old gift idea, gift idea for teenager, birthday party idea Lightweight, Classic fit, Double-needle sleeve and bottom hem