Normally, I am a size 10, but ordered a 10 1/2 because I am using these primarily for long walks/12 hour shifts at the hospital. I wanted enough room for my feet to swell and/or wear thick socks. I have to say, I absolutely love them. I was nervous at first, because the tongue is very thin, but turns out, this makes the shoe that more comfortable. After wearing them for a 3 mile hike, and a work shift- my feet feel great and do not hurt at all! :) great buy