Personalized Mermaid Vibes, Mermaid Tail, Mermaid Silhouette Youth Long Sleeve T-Shirt. Cute, fun and adorable design with mermaid silhouette, starfish and text 'Mermaid vibes'. Modern and trendy gift, perfect for the mermaid lover in your life. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)