Personalized 4th Birthday Mermaid Tail Girls Women's V-Neck T-Shirt. 4th birthday Women's V-Neck T-Shirt - Hot Pink party idea has starfish and mermaid tail with this mermaid is 4 message 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