Personalized Super Trex 5th Birthday Long Sleeve T-Shirt. Rawr! A Trex superhero wearing a birthday hat is surrounded by a colorful burst of confetti. Cool 5th birthday gift for your five year old. 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