This shoe is basically a gimmick.  Very cheaply made, wears out very fast.  For the price I was amazed at how poorly constructed it was.  I was not impressed with this product at all.  A little over a month the sole was wearing down, the top looked very worn, and I think the spring inside broke because the shoe started to lean to one side.  I attempted to contact the manufacturer who only told me to return it to the place of purchase.  When I told them that it was past 30 days and I couldn't send it back they essentially told me that I was out of luck.  I will never buy a shoe made by this company again.