I used the shoes 4x a week on average for under 4 months and I already need a new pair.  The top lining of the insole came off after the third time I wore them.  Then by the sixth time, the insole would slide forward during my workout which continued to happen every time I would wear them and got worse and harder to pull back into place.  There are holes inside below the insole so when the insert slips forward my heal is impacted into those holes leaving marks and pains well after my 60 minute water aerobic workout.  And now into the 4th month, the elastic around the top of my foot is giving out so they feel like they are slipping off which distracts me during my workout.  I can say there were 4 weeks due to holidays and events where I didn't go to my class so realistically these only lasted 3 months.  Now I have to buy another pair and my feet have hurt while I've had these.  My heel actually hurts at the moment and prompted me to finally give my review on a product I've been using since November 2012.  I would not recommend these to anyone personally.  Very disappointing because all of my sport suits are Speedo.