I wear a size 11.5 to 12 shoe and bought the 12.  Its nice and roomy and honestly the Mephisto is one of the only shoes I don't have to stretch out to fit my wide feet.  Comfort wise its like walking on air the insoles are nicely padded.  Construction is great no loose strands of material and I saw no flaws.  Believe me if I am spending this much on shoes purchased from the internet I am going to examine the shoes for any flaws and this shoe meets the eye test for perfection.  Style wise a great shoe that pairs well with jeans or shorts,  Comfort wise no complaints after several wearings.  I live in Vegas and because of the hot summers our office is pretty casual these shoes are perfect for the office as they are stylish and comfortable.