Swimming with Zip VX Fins has many benefits including increased cardiovascular conditioning and ankle flexibility. The use of Zip VX aids in building greater leg strength and increasing caloric burn through the use of larger leg muscles. The ZIP VX leverages the energy created by the fins movement through the water to produce a spring board effect that boosts swimming efficiency, ensures proper body position and increases thrust. The ZIP VX Fin is an excellent tool for all swimmers from the beginner to elite level.