Personalized Monster Truck 8th Birthday Women's V-Neck T-Shirt. Monster truck 8th birthday! A monster truck drives through the frosting on a cupcake, splashing it around in a giant mess. Cool gift for the birthday kid! 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