I love the style and comfort of these but I returned them because of the size. They may run a half size too big. I haven't decided on reordering them at a half size smaller because of the mixed reviews. Actually they are probably just too big in the vertical direction. The sole of the slippers and the thick inserts make them very heavy, and they fall off with normal steps. They only stay on if you are *shuffling* your feet; perhaps that's why they have been named shuf. I have narrow feet with high arches, maybe that's a bad combination for these. I echo the complaint that the backs would not come up on the heel far enough and you end up stepping on them or sliding out. Swapping out the thick inserts may help. I saw another site, zappos, was selling these for $76! who are they kidding?
***Update: the half size smaller is much better, but I could have even gone a whole size smaller for a more snug fit. They really need to sand down the bottom of the thick cork/hemp inserts. If you consider taking out the inserts altogether, order a full size smaller.