These are the fins all professional swimmers have been waiting for. Their innovative design features a sloping surface and hydrodynamic slits in the top to allow you to swim with a faster leg kick and better control. The open heel ensures the best possible ankle flexibility allowing faster upwards notion and a more powerful downward leg kick. Test them out to see how they can help you improve your underwater phase after pushing off the wall. Training your legs vertically using Powerfin Pros for just a few minutes a day will help you improve your underwater phase. The vertical leg kick allows you both to control your body position and make sure you are performing a proper leg kick.