Energy transfer and efficiency - Advanced tightening system reduces energy loss by up to 30 percent and maximizes the transfer of leg power to your fins for improved performance in water activities. Stable, customizable fit - 3-level adjustment system allows easy customization for different foot instep sizes, delivering a stable hold and a personalized, comfortable fit. Effortless strap replacement - Fin Strap uses a patented plug-in system for tool-free, in-seconds strap swaps, enabling quick changes without hassle for optimal efficiency. Durable construction - Made from high-quality rubber material for durability, suitable for frequent and long-lasting use. Use scenarios - Pool training and lap swimming to improve kick power and overall propulsion. - Snorkeling or diving excursions where a secure, comfortable fit matters during extended sessions. - Open-water swimming or watersports requiring quick strap changes and reliable, long-term durability.