This T-Rex hates pushups t-shirt, vintage funny dinosaur t-shirt is great for comedians and teachers of science, prehistoric animals and biology. Tyrannosaurus rex is such a funny creature with small, short arms and big head. Unisex Shirt for Men or Women. About the Shirt: Gildan 64000 t-shirt, an everyday favorite. 100% ring-spun cotton (Sport grey is 90% ring-spun cotton+ 10% polyester, Dark heather is 65% polyester+ 35% cotton, Fabric weight: 4.5 oz/y² (153 g/m²). Pre-shrunk for extra durability