I think I've purchased a dozen pairs of slippers in the past 6 months in a vain attempt to find something comfortable, durable, washable, not too hot, and that fit well.  I wear a size 8.  I *hate* slippers that fit multiple sizes since they are either too big or too small.  These fall into the bit too small but after a few days they stretched out making them much more comfortable.  The only gripe I have is that the padding in the heel wears out almost instantly.  If they could beef that up a bit and make them in single sizes they'd be perfect.  I just washed these for the first time & they held up just fine.  I've ordered an additional pair since I think this is as good as it's going to get as far as non-winter slippers go.