Personalized Big Brother Shark Long Sleeve T-Shirt. Big brother shark! Shark teeth have taken a bite or two out of the letters, but a big brother is tougher than the shark. Cute gift for any big bro! 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