Bought two pairs of these.  one for myself and one for my friend.  We've been looking for a replacement for our  DG apollo and mercury slippers from 8 or 9 years ago.  these looked promising.  Got them from DG web site.  my friend thoght they would flatten out to fast, so we returned hers.  I kept mine in hoping they wouldn't.  i admitt, i was desparate.  well, not two weeks into wearing them only a couple of hours  each night, they went flat AND HARD.. not what tired dogs need at the end of the day.  wish i had not kept them. 49.95 down the drain.  at least shipping was free.  not good slippers.  wish DG would bring back the others. they were HAPPY FEET.  I'll keep searching