I got these flip flops because my old flips (croc capris) hurt my feet if I wore them too long.  The Crocs have 'nubs' the rubbed the ball of my foot wrong.  I heard great things about the Sanuk yoga mat  flips, so I bought them and wore them to a day long trip to Six Flags.  They were great that day.  My feet didn't hurt at all at the end of the day.  I wore them a few more times for a few minutes at a time and they were fine.  The next time I wore them for a day long trip, the yoga mat feeling felt as though it was worn down and my feet hurt very bad at the end of the day.  It was almost like I wore them out in just a couple of weeks.