Personalized I'm The Big Brother Shark Long Sleeve T-Shirt. I'm the big brother! A big brother shark shares a toothy grin with his little sibling. Fun gift for a big guy! 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