Funny Math PI T-shirt Gift for Math Teacher Man/Woman/Youth 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 Need a perfect gift for that math teacher, mathematics lover or nerd in your life? This funny shirt is great for teachers, students, Pi Day and makes a great mathematics joke. No need to calculate, this is the shirt for all Math Geeks! Lightweight, Classic fit, Double-needle sleeve and bottom hem