Dressyday Mermaid Tail Costume for Swimming Swimmable Includes Monofin Dressyday mermaid tail made of quality polyamide fabric with high stretch , making it look more realistic, more flexible. Material:80% polyester, 20% spandex; size: 5 sizes (child 6 to child 14). Our silicone monofin is more flexible, light and toughness, it can adjust by shoelace to fit any foot size. Sparkle mermaid tail is a perfect gift for your princess, excellent for swimming and take photos. Make your mermaid dream come true! Notice: please do not excessive fricted. Based on the particularity of sparkle matirial, all tail fabric will eventually fade and change color after over time used or excessive friction. Only for photo, show and light swimming.