Personalized T-Rex Balloon Birthday Long Sleeve T-Shirt. A cute T-Rex dinosaur wearing a birthday hat has a balloon tied to its tail. It is singing and playing the guitar, wishing you a happy birthday! Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL