These, like my three previous pairs of Merrell's, are very good looking and well made, with very nice materials.  Unlike my other pairs, however, the backs of the heels lack padding.  They're not uncomfortable, but that lack of padding allows my left heel to slip, causing a hot spot.  If I wore the shoes long enough, it would definitely be enough to cause blistering.  Interestingly, I tried on a similar pair in a store (Merrell Moab Rover) and they fit very well, with no heel rubbing.  These are going back to Amazon this week.