PRICES MAY VARY. Solid colors: 100% Cotton; Heather Grey: 90% Cotton, 10% Polyester; All Other Heathers: 50% Cotton, 50% Polyester Imported Pull On closure Machine Wash this funny chemistry design for men and women with a funny saying is the perfect gift for chemists, nerds and science students. I Tell Bad Chemistry Jokes Because All The Good Ones Argon Lightweight, Classic fit, Double-needle sleeve and bottom hem