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With Speedo’s own Biofuse technology and using pure silicone, these fins are designed to enhance your body’s natural ability in the water. Their dual density design – a stiff blade with a soft, comfortable foot pocket – is tailored to improve your performance and speed during your swim workout. Through increased resistance comes a bigger muscle workload, strengthening your legs and building endurance. Fitness Fins also force ankle extension during kicking, which makes the kick more propulsive and efficient.