Funny Engineer Engineering Shirt 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 Please don't tell my mom I'm an engineer she thinks I'm a piano player in a whorehouse. Makes a great gift for dad, mom, son or daughter. Fathers day, mothers day or even a birthday. Lightweight, Classic fit, Double-needle sleeve and bottom hem