Kids This Guy Is Officially 11 Years Old Cool 11th Birthday 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 A great 11th birthday gift idea A fun kids birthday present Lightweight, Classic fit, Double-needle sleeve and bottom hem