The short arena unisex Training Fin Powerfin Pro II is perfect for competitive swimmers. It is designed for power training and leg kick improvement. With a short blade for maximum forward thrust, the open heel ensures maximum ankle flexibility, optimal stability and comfort. Equipped with special notches on the bottom ribs for faster kicks and side grooves for better control. Left and right fins are shaped individually. The soft silicone material provides maximum comfort and reduced chance of blisters. PVC free.