Engineer shirt - Trust me, I'm an Engineer Solid colors: 100% Cotton; Heather Grey: 90% Cotton, 10% Polyester; All Other Heathers: 58% Cotton, 42% Polyester Imported Machine wash cold with like colors, dry low heat Engineer shirt - Trust me, I'm an Engineer engineer shirt, engineering shirt, engineering t shirt, engineer t shirt, engineer shirt funny, aerospace engineering shirt, petroleum engineering shirt, aerospace engineer shirt, electronic engineer shirt This premium t-shirt is made of lightweight fine jersey fabric Fit: Slim (consider ordering a larger size for a looser fit)