Coastacloud Mermaid Swim Fin Flipper for Kids Child Swimming Training Toy Increase Water Confidence. Quick Release Foot Strap. Adjustable Neoprene Foot Strap. Build Leg Strength. The Mermaid Fin is a fun monofin pool toy ideal for young swimmers. And a good toy for kids. It's teaches a balanced dolphin kick while also allowing children to increase their confidence in the water. Great for Summer Swim Training and Open Water swims.Durable for using and comfortable to wear.