Birthday Boys Tshirt 3rd 4th 5th 6th 7th 8th 9th 10th 11th 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 Perfect for your Birthday Boy to wear on His Birthday. Birthday Shirt Birthday Party Tshirt Lightweight, Classic fit, Double-needle sleeve and bottom hem