I'm a huge crocs fan, but they must have changed the glue or something since I bought my first pair of these a few years back.  The last two pair that I've purchased have had the sole inserts start peeling off.  They must be using some water soluble glue or something.  The issue seem to start after I've been through an unexpected shower with them.  With my first pair, you could wash them them up, no problem.  Now, I'd be afraid to do that.  I bought these last month and the sole has already started to peel.