ScubaPro Open Heel Twin Jet FinsOpen Heel Twin Jet Fins 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