Math Teacher Shirt - Math Is Hard T shirts 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 Math Teacher Tshirt, Math Teacher Tee Shirt Math Teacher Shirts, Math Teacher T-shirt Lightweight, Classic fit, Double-needle sleeve and bottom hem