Power BandsPure silicone Power Bands are loaded with energy on the power stroke. They release their energy prior to the upstroke to provide an added boost of power Instead of wasting your energy, you accumulate it and reclaim it! Power bands lessen fatigue and add thrustGear Shift3-speed Gear Shift customizes your speed to effort ratio to fit the specific conditions of your dive Three different settings are available Easy to shift during the dive, even with glovesMid-foot Flex JointThe blade is attached to the foot pocket using two Mid-foot Flex Joint This takes the strain off of the toes and the top of the ankle. The result is a dramatic improvement in comfort You can now use the entire foot to power the fin rather than just the front half of the foot Provides the blade a significantly larger range of motion, often up to 5 times that of a conventional fin