Personalized 4th Birthday Sailboat Women's V-Neck T-Shirt. Sailboat with number 4 for your child's 4th Birthday comes on a party Women's V-Neck T-Shirt - White gift. 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