Personalized 4th Birthday Monster Women's V-Neck T-Shirt. 4th birthday monster. A cute monster holds a bright yellow balloon to celebrate the four year old's fourth birthday! Great gift for your little monster! 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