Personalized 6th Birthday Monster Truck 6 Year Old Women's V-Neck T-Shirt. Colorful boys Monster Truck 6th Birthday Women's V-Neck T-Shirt - Aqua for his big birthday party day. 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