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