Per other reviews, I ordered a size up and I am glad that I did. I normally wear a size 9.5 so I ordered size 10. These flip flops are a little snug so the fit was perfect. My only complaint - and the reason for a 4 star review - is that the straps tend to rub my feet. I wear them all day and have to keep slipping my feet out so they do not get too irritated. Since the straps are leather, hopefully this will work itself out. Other than the straps rubbing, these flip flops are wonderful! They are my third pair and I swear by Olukai brand flip flops. I have an old knee injury that is bothered when I do not wear supportive shoes. These flip flops are supportive, comfortable and durable.