I wear an 11 in all shoes so I ordered an 11. Despite people recommending to order a size down, I ended up ordering my typical size and they fit very well. I can't see a 10 fitting. I haven't worn them out yet but I wore them around the house a bit to try on and I can definitely see the back support, ankle strap, and foot straps rubbing until they're broken in. I also noticed my heel making an airy noise when walking. I love these though.