The Wave is a youth size recreational monofin that teaches younger swimmers the undulation needed for a proper dolphin kick. Safe to use in a pool, lake or ocean, the Wave will build a child's leg strength and make them a more confident swimmer. The Wave has a built in stability ridge for proper flexion and comes with an adjustable heel strap that can be fitted to men's US shoe sizes 1 to 7 or women's 2-8, making it a great product for beginning competitive swimmers. The Wave comes with quick-release foot straps for added safety and easy adjusting. Plastic protection inserts are included in order to keep the shape of the foot pocket during storage.