A well-designed split fin is fast and maneuverable, enabling you to cover a lot of ground without cramping leg muscles or straining ankles. The TWIN JET MAX features a dual-compound design that offers a slightly stiffer blade with a little more feedback than what you might expect in a flexier fin. Employing what's known as "propeller technology," the distinctive split hydrofoil shape of the TWIN JET MAX blade allows water to flow between and around each of the twin blades.