This is my first pair of slippers and I was at first very pleased because they were warm and easy to slip on which is what I was looking for.  But after a month or so I now am noticing they are starting to wear down already.  The sole has become loose almost as if the "glue"? holding it together has worn away.  This is disappointing because I have to make sure to push it back in before wearing them each time.  But since I wear them in the house only I don't find it that terrible.  If you wore these outside I suspect this would be a major issue as the ground/dirt/cement would be rougher on the slippers than your carpet or wood floor.  All in all I am happy with them as an indoor slipper only.