Speedo Training Aids offer a complete solution for swimmers of all abilities who are looking to improve their health and fitness, technique or performance in the water. Developed using the latest technology and materials, and tested by our top athletes, Speedo Training Aids are the perfect accessory for any swim session.These fins in particular are geared towards increasing ankle flexibility and leg strength. As your speed in the water increases with these fins, there will be a greater importance on you to hone in on the perfect technique with your lower body to produce the best results.*Engineered to increase speed through the water*Improves leg strength and ankle flexibility*Dual density design, offering stiff blade and soft comfortable foot pocket*100% silicone