Personalized Dinosaur when i grow up t-shirt T-Shirt. This is what most of us dream about when we are little babies, right? Now, make your babies dreams come true! Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.