Math Is My Weapon Ninja T-Shirt Funny Math Geek Tee 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 This is the perfect math t-shirt for any mathematics geek, calculator nerd, problem-solving, algebra and fraction-loving person you know. Featuring a math ninja wielding his weapons like a shiruken, this nerd tee shirt is a hip option for wearing to math class. Lightweight, Classic fit, Double-needle sleeve and bottom hem