Personalized Superhero 7th Birthday Women's V-Neck T-Shirt. Happy 7th birthday! Celebrate your child's seventh b-day with a cool SUPER 7, superhero gift. Happy Birthday seven-year-old! 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