Personalized 4th Birthday Unicorn Women's V-Neck T-Shirt. A pink unicorn surrounded by a colorful rainbow, next to a sunny yellow 4. Cute gift for the birthday girl's 4th bday! 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