I have a narrow foot and would say this runs "narrow to medium" in the heel area and wider in the toe box. I will put a thin insert in it to get it a bit snugger for my narrow foot. Sole is somewhat thin, so probably not a "walk all day on asphalt in the city" shoe, but fine for the office or casual use. I like this shoe because it is casual, but the buckle and thin-profile sole give it a dressier look than many other slip-ons.