Speedo Swimming Training Fin 100% Silicone Improves Strength & Endurance Add speed and power to your workout with our Training Fin. Wear our comfy Training Fins when you need easy speed during technique drills or want to work harder in the pool. The extra propulsion helps develop ankle mobility whilst the added water resistance challenges the lower body, improving strength and endurance. 100% silicone. Speedo Biofuse technology for maximum comfort and fit 100% Silicone for excellent comfort Strengthen leg muscles - added resistance increases the workload on your leg muscles which improves strength and endurance Increase workout speed - Training Fins add extra propulsion to the stroke, which increases speed with minimum effort leaving you free to ingrain correct technique. Develop ankle mobility - The increased surface created by the Training Fins forces ankle extension during kicking, which makes the kick more propulsive and efficient. SKU: 8-08841F960