Ichthyornis Dinosaur Skeleton Shirt, Nerdy Biology Gift 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 Great gift for birthday or holiday An excellent idea for the archaeologist, biologist or dino enthusiast in your life Lightweight, Classic fit, Double-needle sleeve and bottom hem