Personalized I'm The Big Brother Shark Youth 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! Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.