Mermaid fins big feet swimming training flippers long fins flippers adult models For shoe size 36-45. . Single-piece ankle Let swimming be fun and enjoy Flexible cymbal design Helps to correctly make the wave kicking action required in a balanced dolphin-style kick Exercise the strength of the legs and core muscles Dolphin-style leggings use 60% of the body's muscles, including the core muscles and lower limb muscles. Quickly open foot strap Safer to use underwater, easy to adjust ankle . Open toe design Suitable for American men's shoes 8-12 or women's shoes 9-13 (European 40-46) Stable ridge and groove Designed for proper bending and speed .note! Do not use in excessive waters that exceed swimming capacity. All users of this product are responsible for the risks associated with the use of the product. Risk of injury, regardless of proximity or distance. The manufacturer and seller of the product are not responsible for any liability