Your Ignorance Is A Lot More Dangerous To Society Than My Pi 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 T-shirt Your Ignorance Is A Lot More Dangerous To Society Than My Pitbull T-shirt Lightweight, Classic fit, Double-needle sleeve and bottom hem