Recently Upgraded To Version 12.0 Funny 12th 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 Computer nerd humor 12th birthday gift idea Funny gift for any coder or gamer turning 12 years old Lightweight, Classic fit, Double-needle sleeve and bottom hem