Personalized I'm Three Mendous Toddler T-Shirt. I'm Three Mendous! Pow! Wow! Third birthday comic book style for your tremendous little superhero. Great 3rd birthday present. A toddler-soft cotton tee in look-at-me, big kid colors. 4.5 oz., 100% combed ringspun cotton. White is sewn with 100% cotton thread. Topstitched rib crew neck. Double-needle stitched sleeves and bottom hem. Shoulder-to-shoulder taping.