Cressi Reaction EBS finsReaction EBS Fins Cressis most technically advanced fin, the Reaction uses a completely new polypropylene blade material that is more reactive, flexible and trim than previous designs. It kicks easily yet powerfully and is suitable for divers of every experience level. The longer blade efficiently transfers energy from the computer designed foot pocket, and like other Cressi fins, the blade extends from the top of the foot pocket to maximize its