If you have narrow feet and order up a full size, these might work for you.  If you want them for a winter boot, then you MIGHT be able to put a wool sock in them. I run between and 8 and 8 and a half and these were a 9. There is only one width available and medium did not cut it for me. I don't think going for a 10 would have helped.  The sole was rather thin for a company that talks about the orthotic benefits of their shoes. Their sandals are supportive but I just did not see that quality in these. They would have been OK at this price if they had fit but I would not pay full price for this or even their other top selling boot. If you don't need a lot of arch support and your foot is in good shape, they would probably help to keep it that way, but if you have problems, these will not solve them. I will stick to their sandals from now on.