Scubapro Modular Fin System Boot-Fit Pocket (For Supernova / S-Tek)SCUBAPRO's innovative two piece design Modular Fin System, with blade and foot pocket molded separately, allows you to easily switch the foot pocket or blade for different types of diving. The Modular Fin System Boot Fit Pocket is an open heel foot pocket that can be paired with the Seawing Supernova or S Tek blades. Use the fins easy Socket Lock Connecting System to pair the Boot Fit Pocket with a blade and youre ready to hit the water. Compatible