All VIPERs have neoprene padded foot pockets. They are made in California and are molded from superior American floating rubber compounds. They have a strong spring action not found in any other fin on the market. The Viper’s strength does not come from being rigid and stiff. It comes from the blade’s patented design which produces torque (an increasing resistance to flex) and "snap" to the blade (memory). These actions channel the water between the vertical side rails and off the straight blade tip for a directed thrust. This produces the most efficient kick possible.