I had these shoes for about 4 months and wore them only a few times.  As I walked over to my desk one day I heard a strange pop and a hissing noise and when I checked I discovered that the noise was one of the bubbles deflating.  These were not worth the money and they lasted shorter than any pair of shoes that I've ever heard of.  I never ran in them knowing that was not what they were intended for, I wore them walking on streets and indoors.