I wear 10 and ordered a 10. I have other Ryka shoes which I love, and the size has always been consistent.

With these, the heel and midsole were wide enough and didn't feel crowded, but the overall length was just a bit short and the toe area seemed a bit narrow. Also, these have stitching that cut across my pinky toe and would have definitely rubbed a blister. I didn't take that chance - sent them back before wearing them and ordered a different style of Ryka. My fingers are crossed the other style will work because it appears that the ones I love have been discontinued.