I normally wear 8 1/2 but when I buy flats I need to go up to a 9.  So I ordered a size 9 and they felt a bit short and narrow.  Not terrible. I had no heel slippage which is great for this shoe style. They are flats so I did not expect much arch support but they were comfortable to wear all day.  Nice with jeans and a pair of black slim dress pants if you have the right top as they are a pretty casual shoe.