The FINIS Edge fins are designed to improve technique and give your legs a real workout. It takes power to push these fins through the water, which results in building strength and endurance. Challenge yourself and take on rougher waters with the help of these swimming fins. Train and work on your skills while getting a workout at the same time. The side rails on the fin activate your hips and quadriceps enforcing a proper kick that starts at your hips and not your knees. This motion is great for glute and hamstring development. The FINIS Edge Fins are guaranteed to make your body move and help you create and improve your form under the water. The fins are made of 100% silicone that will mold to your feet over time for better control and fit. This set of fins is great for advanced and professional level swimmers who want an extra boost when swimming or doing laps. Find your perfect fit and choose from the range of sizes available.