Personalized 6th Birthday Superhero Women's V-Neck T-Shirt. Pow! Happy birthday to the 6 year old! 6th birthday gift for your little superhero. 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