Personalized 1st Birthday Comic Book Long Sleeve T-Shirt. Pow! Happy birthday to the 1 year old! 1st birthday gift for your little superhero. 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