I Ate Some Pie and it was delicious Tshirt 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 Funny Math Tshirt for Geek Nerdy Shirt for Math Student Lightweight, Classic fit, Double-needle sleeve and bottom hem