Personalized 12th Birthday Unicorn Women's V-Neck T-Shirt. 12th birthday unicorn Women's V-Neck T-Shirt - White that says this girl is 12. 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