Personalized I'm 4 Dinosaur T-Shirt. I'm 4! A grinning dinosaur wearing a birthday hat rips through the background to wish your little one a happy birthday! Great gift for your four year old. Everyone loves our Custom T-Shirts! 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.