I'm a 7 1/2 - 8 and I ordered an 8. I should have gotten a 7.  Now, I got these because the arch support and the deep heel cup are supposed to help with plantar fasciitis, however...that has not been my experience.  Furthermore, within an hour of wearing, they make my toes stink!  Doesn't matter if I just got out of the shower, if I only wore them around the house, if I used foot powder.  And no, I do not have an issue with smelly feet.  I would understand if I was wearing these for 10 hours straight on a hot, humid day of...I dunno...furniture moving, or something.  But without my feet even getting sweaty at all these leave me with stinky toes.  I would gladly put up with that IF they helped with the plantar fasciitis.  They don't.  No improvement at all.  Now they just sit in my closet floor.  Wish I hadn't wasted the money on them.