The thread that runs through the top of these caused a lot of pinching on my foot after the first half hour of wear.  I tend to use PUMA ballet flats as work shoes because my commute involves about three miles of walking each day, in 3/4 mile increments.  By the time I had finished my walk to work, I couldn't think of anything but taking these off.  I even took the spare Zandy's I had in my desk out for snow days and wore those for most of my work day. I hope that these will break in, but so far, I haven't been able to bring myself to wear them again...