Split fins are fun. They're fast and maneuverable, and by keeping the fins within your body's slipstream and using a relaxed flutter kick, you can comfortably cover a lot of ground without cramping leg muscles or straining ankles, and that equals a more enjoyable time spent kicking around under water. You won't find a better provider of maximum propulsion with minimum effort than the TWIN JET. Employing what's known as "propeller technology," the distinctive split hydrofoil shape of the blade allows water to flow between and around each of the twin blades, which flex independently to produce propulsion. For divers looking for a comfortable fin that delivers a propulsive kick with minimal feedback, the TWIN JET leads the pack.