Tendol 3 Pc Swimming Mermaid Tail, Monofin Compatible, For Children, (Mono-fin not included) (Blue, Small) NICE DESIGN AND HIGH QUALITY. This Mermaid tail is made from high quality material 80% Polyester 20% Spandex SIZE VARIATIONS AND COLORS. This tail is available in 4 sizes Small, Medium, Large And X-Large, please refer to our size chart to check what size you need. Please note. Length of tail is designed to use with a mono-fin (Not Included) please be aware if it's used without mono-fin tail could be a little long. MONO-FIN COMPATIBLE. Special designed to fit with Tendol Mono-fin (Sold separately) Most mono-fins will fit too. EASY AND COMFORTABLE. Tail is made out of very comfortable swimsuit material, it's washable, (Please check the instructions on label) it has a zipper in the side and an opening in the bottom to ensure ease of use. This tail should be used only with adults supervision.