I usually wear 9-10 depending on the style. My feet are wide, but not so wide that I normally have to order C/D or W shoes. I had ordered these specifically because they were the top rated running shoes for a wider foot (from a list on another website) that were light but supportive, and looked cool. I ordered these in a 10 and could barely get my feet in them. I'm not sure if the tightness was making the inner mesh lining crunch up somewhere, or if they were just so tight I was feeling the seams, but they were really uncomfortable and I'm returning them. They look cool and if I had narrow feet they might be great but I'd still buy the biggest size from my normal range.