Personalized I'm One Comic Book Women's V-Neck T-Shirt. Pow! Cool! Ka-Boom! I'm One! Cool comic book style birthday gift for any one year old superhero's 1st birthday! 5.0 oz., 100% pre-shrunk cotton Athletic Heather is 90/10 cotton/polyester 1x1 rib collar with mitered v-neck Shoulder-to-shoulder taping Ladies' fit