After studying the history of shoe design, it’s very simple. The only reason we have heel lifts is to make people taller. When studying physics of feet, you learn that ANY abnormal heel lift throws off our fall line thus creating all kinds of compensations up and down the kinetic chain. Add some coil springs big enough for a Volkswagon to the mix, and it spells trouble…it actually spells something else I’d like to say, but I’m doing my best to keep this site family friendly. To think we can outsmart nature with spring loaded shoes is pretty funny…not really, but you get the point hopefully. If not, you’re feet will. For more information, see my Products Section.