Prehistoric Ape to Monkey to Man to Robot Evolution 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 Prehistoric Ape to Monkey to Man to Robot Evolution Shirt Show your nerd geek side with this Robot evolution tshirt Lightweight, Classic fit, Double-needle sleeve and bottom hem