I bought Gravity Defyer sneakers about six moths ago. Within weeks the tip of the sneakers had come off. I used crazy glue to try to repair them. I did this three times.
The next problem was when the springs just came out of the heel. There is no repair for this! These sneakers are just plain junk and probably made in China. I paid $150.00 for trash they call quality shoes. Take it from me don't buy them, just plain crap.