Exclusive swim fins for general swimmers Also great for challenging dolphin kicks strengthening The softest type of the traditional Tech 2 fin has been made even softer. For swimmers who want to train their kick skills with serious instances of a fin for easy swimming, etc. 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.