I ordered an 8 because these were very close to another shoe like this I liked and thought it might be close enough to it. That's what I get for thinking! Lol. I haven't had the chance to wear all day so I'm not sure about that one. This  fits but there is no space in front or back at all.  Could also be a bit wider but that's not a big deal since these are flip flops. The arch support is better than nothing or just regular flip flops, but could be better. If I had gotten a larger size then would have been to big across where the straps are. So all in all I give three stars.