Usually wear a 8-8.5 and I got a 38. It is somewhat tight on the top so Ill have to be sure to wear thin socks or compression stockings. I bought these to wear to work as I am a RN. They felt great and my legs didn't feel as tired as usual. BUT within the first day of wearing them a got a scuff mark! I really wasn't doing anything crazy. A bit disappointed that it was so easy to get scuffed. Ill keep them though because I got them on sale and I don't mind the scuff marks but just a little disappointed since they are not cheap shoes! But other than that I love the brand and quality. Much better than Danskos! These are lighter weight, great arch support and cushioned with my foot.