Cressi Reaction, blue/azure, L/XL Open heel foot pocket fins with elastic bungee strap for scuba diving Made with the exclusive Cressi (patented) molding technology in three materials, ensuring unmatched performance Polypropylene blade really reactive, flexible that start directly from the back of the foot pocket The lightweight blade develop a remarkable propulsion with minimal muscular fatigue, enabling to safety face even in a critical underwater situation The EBS elastic bungee system is easy to put on and ensure a comfortable fastening for the foot