I am a size eleven, but after reading reviews that said they ran small I ordered a twelve and I was surprised that they fit well and somewhat small even. I've only worn them for about a week and not very long at a time. I've developed a small abrasion on my right foot between my toes where the strap goes through. Just not used to the fit yet I suppose. Hoping to break them in during my upcoming vacation. I have always worn cheap flat thongs, so the thick soles on these is taking some getting used to. However, I like the support they give and hope I will grow accustomed to them. Four stars is my initial impression. It is too early to tell if which way it will go from here.