Unique Swim Fin Design: The asymmetrical blade design of these swim flippers allows the swimmer to build power while promoting a natural inward supination, perfect for breaststroke, butterfly, backstroke, and freestyle High-Quality Swimming Fins: The foot pocket of these FINIS swim fins is designed to place feet in an ideal swimming position for maximum performance FINIS Swim Fins: These swimming fins for men and women help increase leg strength, foot speed, and ankle flexibility, making them ideal for individual medley training Customizable Swim Flippers: The Positive Drive Fins feature a closed-toe design and an adjustable heel strap for a customized fit that secures the fin and allows feet to flex more naturally About FINIS: Our mission is to simplify swimming through innovation, high-quality products, and a commitment to education