I normally wear a size 9 1/2 depending on the shoe, and ordered a 9 after reading some general reviews about Vionic sandals. The length was actually a tad long, so the arch support did not hit quite right. Because the arch is pronounced, that needed to be spot on. I do not have "wide" feet, but this sandal runs narrow in the foot bed, and the outside of each foot was hanging slightly off of the shoe. Since I have some foot issues, and since Vionic sandals seem to be mostly highly rated, I thought I would try one, but this shoe is all plastic, and it sure feels like plastic. I can't even imagine wearing this sandal in the heat. I'll stick with leather. I am returning this sandal.