I bought these slippers for my BF who has chronically cold feet. He loves them and wears them constantly in our house... we have all wood floors in an old character home and the floors can be quite cool in the middle of winter. Do keep in mind that my chilly-toed BF also wears very thick wool socks as part of his daily wardrobe.

In terms of sizing, he wears a 9/9.5 and I purchased a medium for him. A pretty good fit except that there is not much support so adding an insert has made them a bit snug.

It would be great if Acorn made these with slightly more support... I'd pay extra for a good quality and durable slipper. I worry that they won't last as long as I (or he) would like them to.

At the end of the day, these are very good value and I'd recommend them to anyone looking for a comfy slipper to wear around the house, camp, or cottage!