A revolutionary fin able to outperform the performance of today's traditional design fins, reducing the effort of fins. Twin Speed fins are the perfect synthesis of style and performance. They offer more flexibility, more propulsion and more comfort. All SCUBAPRO double-fins use an innovative propulsion technology that uses a revolutionary blade to produce a forward thrust with a considerably less effort than any traditional type fin. The secret is the patented design that conveys the flow of water into the hollow and around each lobe. The two lobes flex independently to produce the propulsive thrust, just like in a propeller. In addition, they are inclined to exert uniform power on both movements of the kick, upwards and downwards, offering a fluid propulsion.