What does the term "split fin" refer to in scuba gear?

The term "split fin" refers specifically to a type of scuba fin that is designed to enhance efficiency while swimming with reduced effort. These fins have a unique shape, featuring a divided blade that allows water to flow through the splits, which helps reduce drag and enables a more effective propulsion with less strain on the diver's legs. This design is particularly beneficial for divers who may need to swim for extended periods or for those who might struggle with traditional fins due to fatigue or physical limitations.

By utilizing split fins, divers can achieve greater speed and maneuverability while consuming less energy, making them a popular choice among many scuba divers. The other options provided do not accurately represent the characteristics or advantages of split fins.