BSpeedo Nemesis Swim Fin ReviewbP PP Speedo Nemesis Swim Fin PScalloped outer edges create greater surface area to enhance propulsion, allowing the swimmer to push more water during kicking drillsPMedial blow valve edge openings and multiple flow channels to create more resistance and encourage correct orientation for maximum kick efficiencyPBuoyant injection molded EVA foam to keep hips and feet in more streamline position with finger hole on top for ease of getting on the footPFits Men 6-7, Women 7.5-8.