Personalized Birthdaysaurus Rex Men'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! 4.7 oz., 100% pre-shrunk cotton Narrow, set-in 1x1 mitered V-neck collar Shoulder-to-shoulder taping Double-needle stitched sleeves and bottom hem