Tusa X - Pert Zoom Fins

When using a standard flat fin, propulsion is inhibited solely by fault of design. When the leg is completely extended, there remains an angle of 27 degrees between the heel of the foot and the calf of the leg,
With the SF-8 fin, that 27-degree angle has been incorporated into the fin. This means that when the leg is fully extended, even though the angle exists between the foot and the calf, the fin ends up parallel to the leg. This means that 100% of the energy expended during the kicking phase is giving the most propulsion using the least amount of energy

HBK* STIFFER COMPOUND