I Am 21 Years Old Square Root Funny 21st Birthday 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 A great 21st birthday present A funny birthday gift for anyone who is turning 21 years old Lightweight, Classic fit, Double-needle sleeve and bottom hem