Arena fins arena powerfin pro flex black short-blade training fins built for competitive swimmers who mean business. Improve your training with this short and flexible arena powerfin pro flex, which is perfect for competitive swimmers and longer training sessions. Designed for power training and leg kick improvement, the short blade delivers maximum forward thrust while the open heel ensures maximum ankle flexibility, optimal stability and comfort. Special notches on the bottom ribs promote faster kicks, and side grooves provide better control throughout every length. The soft, pvc-free silicone material provides maximum comfort and a reduced chance of blisters. Train harder. Kick faster. Go further. Short blade open heel 100% silicone pvc-free left-right fit power training 3 key features maximum forward thrust the short blade is engineered to generate maximum forward thrust with every kick cycle. Special notches on the bottom ribs promote faster kick turnover, while side grooves give you precise lateral control. This combination makes the powerfin pro flex a serious tool for competitive swimmers focused on leg power. Open-heel flexibility the open-heel design frees your ankle to move through its full natural range, which is essential for developing an efficient kick technique. A toe opening adds a broader range of motion so the fin works with your stroke rather than against it. The result is optimal stability and comfort across long sessions. Long-life silicone comfort c...