Needed a good work boot to wear all day in all temperatures, so purchased size 9.5 to be roomy. I normally wear 8.5 and the size 9.5 . I purchased 2 pairs, both 9.5, but both do fit well. Still slightly roomy for me, but probably not with thick winter socks. The boot should work, though, as it's very comfortable so far. Haven't worn for very long, so I don't yet have an endurance test, but I have a good feeling about this boot. I work in a generally sexist environment, so what better way to be tough than pink satin laces and a little faux pearl on each heel.