he outer rails provide the main structure and rigidity, storing and releasing the energy
Semi rigid panels in the blade provide designers with control over how the blade flexes and changes shape during the kicking cycle, allowing precise wing shape.
The split blade allows the fin to form a pair of wings to cut through water to reduce drag which effectively drags the diver forward.
A high surface area improves directional control
Strong but flexible joints between the semi rigid panels allow the blade to react far quicker to each kicking movement
The position and shape of the foot pocket provides a stress free fit