Gravity Defyers, were designed by the Impact Research Technology Laboratories (IRTL). They absorb shock and propel you forward with a patented "secret" hidden in every heel. You wouldn't drive around in a car without shocks would you? The reciprocating power of Gravity Defyer Footwear absorbs the painful shock of each step and returns that energy to you with a bounce that is out of this world. They reduce the wear and tear that gravity imposes on your body, allowing you to move about more freely and enjoy your life.