One must always keep clam at Aperture Laboratories. Especially when one is dealing with Wheatley, "the dumbest moron who ever lived. This navy, slim fit adult shirt is made of 100% cotton. Be sure to check out our Size Chart to get an idea of the average size and dimensions of this Portal 2 Keep Calm tshirt style. Check back often for some of our Portal 2 clothing and other Portal 2 merchandise at great prices only at AnimationShops.com