How Planes Fly - Aerospace Engineer T-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 Aerospace Engineers this is just for you. If you love engineering then show the world with this great t-shirt. Mens, Women And Youth Sizes Available Lightweight, Classic fit, Double-needle sleeve and bottom hem