Personalized Birthdaysaurus Rex Women's V-Neck T-Shirt. Birthdaysaurus Rex - A cute, smiling T-Rex dinosaur wearing a birthday party hat and holding a cupcake. Great gift for any dino lover! 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