I usually wear size 9.5 shoes, but I had heard that these sandals run small, so I ordered a 10. The 10 was still too small, so I had to return them. I was also a bit disappointed in the quality of the sandals. They were much less robust than my old Keen sandals. The sole was thinner, and the draw string was a smaller diameter than my old pair. I really don't think they would have held up for all the years that my old Keens lasted.