Personalized 4 Year Old Monster 4th Birthday Party Women's V-Neck T-Shirt. Happy 4th Birthday Women's V-Neck T-Shirt - Aqua for a four year old with cute monster holding a balloon 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