The Good Thing About Science 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 The Good Thing About Science Shirt, The Good Thing About Science T Shirt, The Good Thing About Science Tshirt Science Shirt, Science T Shirt, Science Tshirt Lightweight, Classic fit, Double-needle sleeve and bottom hem