Found many boxes of Force Fin drawings, this one is interesting. Leg movement to snapping action of the Force Fin Hand cast USA Made, Poly-Urethane Force Fin. The use of High Performance Material allows us to be smaller. Watch the rebond in this video, then try the same with your fins..I dare you to go HIGHER. We flip and snap like a FORCE>
All four pairs of my fins are up to that task. Easily.