The Cressi Light fins are specifically designed for pool use and for swim training, but can also be used adequately for recreational swimming and snorkeling. The short blade is made of a highly reactive and light material which guarantees agile and effective kicking while not tiring out your legs. The length of the blade has been researched and studied by Cressi to ensure perfect muscle training without causing cramps or discomfort. The anatomically designed foot pocket is made from soft rubber elastomers, and it houses the foot with a great deal of comfort, even during long swimming sessions.