Personalized Unicorn 4th Birthday Women's V-Neck T-Shirt. Unicorn 4th Birthday - A pastel unicorn jumps over a colorful rainbow and smiling cloud. Cute gift for the four year old's fourth 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