So you want to get the fin that the world record holders are wearing well here it is. The Waterway Glide fin is a composite fin that is so well designed that you will actually kick less to get just as far (saves energy). You try this fin once whether in a pool or on a depth dive and you will feel the difference. The foot pockets are open heel design and are meant to fit tight (most people go up one size to get a more comfortable fit). It comes in several footpocket sizes (they fit big) as well as in Soft/Long Distance (better for pool training), Medium (the chose of most depth divers), or Hard (this one is very stiff).