TUSA SF-15 X-Pert Zoom Z3 Open Heel Scuba Diving Fins Pair of Tusa X-Pert Zoom Z3 Open Heel Split Fins with Spring Straps TUSA X-Pert Zoom Z3 Open Heel Split Fins: Combines: Propeller-Fin Technology TUSA's Multi-Flex Blade System and Patented Angled Blade Design X-Pert Fin Provides Speed & Power w/Less Effort & Fatigue