Laughing Gas HeHeHe Chemistry T-Shirt Science JokesMachine wash cold with like colors, dry low heat A good, cool, funny gifts for chemistry major, geek, nerd, mom, dad, friends who work in a lab and loves puns. Also a great gifts for chemist teachers. This novelty chemist jokes tee shirts for youth, kids, boys, girls, teens, women and men. For a more loose fit, please order a size up. Lightweight, Classic fit, Double needle sleeve and bottom hem We use high quality and Eco friendly material and Inks!