Competitive swim fins for top swimmers It also works great for hard kicks and dolphin kicks The ultimate hard type that exceeds the hard type of the traditional Tech 2 fin. It is designed for swimmers who want to train their kick power without the fin for easy swimming, etc. It is soft and floats in water. The most unique V-Rail side edge is designed to balance even the hardest kicks, creating powerful propulsion. V-Rail is patented in Australia, USA. The fin blade has different shapes on the left and right sides of the fin blade has been specially designed to prevent unnatural twisting on the ankle and leg. There is a hole in the back of the toe, so it is difficult to cause unnatural convection that occurs when kicking, and the water can be drained at high speed.