The Speedo Biofuse Fitness Fin is designed for adult swimmers looking to enhance their training. Featuring Speedo Biofuse technology, these fins offer maximum comfort and a secure fit. Constructed from 100% silicone, they provide excellent comfort for extended wear. These fins are engineered to strengthen leg muscles by increasing resistance, thereby enhancing leg strength and endurance. They also help increase workout speed by adding extra propulsion to your stroke with minimal effort, allowing you to focus on perfecting your technique. These fins are ideal for swim training and improving overall swimming performance.