These snoozies are very comfortable. I wear a size 9 and the 9-10 fit me perfectly. The only reason that it doesn't get a 5-star rating is that I think that they aren't quite as warm as my "fuzzy socks". I love the grips on the bottom though. And keep in mind that these are more like socks than slippers - they have no sole of any kind (which I knew when purchasing). My boys each have a pair too and they love them.