I wear a size 7.5/8 in women's shoes normally, but ordered a size 7 in the Fitflop. The smaller size fits well.  I think I have plantar fascitis, and bought the sandal for heel pain.  The sandal did help with heel pain. I only wear the sandal in the house.  My issue with the sandal involves the  piece of material that comes out of the shoe base and runs in-between the toes.  That plastic piece has just a tiny edge that digs into the top of my foot, at the base of my 2nd largest toe (when I walk).  I think I'll use a little piece of black electric tape to help smooth out that rough edge that digs into my foot, instead of using a bandaid as a cushion.