I followed the advice of those who said to go a size smaller and they fit perfectly! I'm a size 6 M and ordered the equivalent of a size 5 N. They are lovely and oh so comfy from the moment I put them on!

I must add that the cork sole cracked after just a couple of weeks of use. It looks like you shouldn't bend your foot if kneeling since it can crack. I contacted the seller Sole Connect and they were great. They exchanged the shoes promptly. I am still very happy with my shoes since they are so comfortable. Too bad the sole is not more durable. These are very comfortable!