Personalized I'm One Comic Book Toddler T-Shirt. Pow! Cool! Ka-Boom! I'm One! Cool comic book style birthday gift for any one year old superhero's 1st birthday! 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.