After reading numerous reviews on this shoe recommending to size DOWN, I initially chose the size 6. My normal shoe size is a 6.5 and I have a narrow foot. However, I normally wear a 7 in most Nike shoes, so I should have known better. After receiving the size 6 it was a bit too small for my foot. There was plenty of room in the toe, but when I tried to walk in them, my toes were jammed to the top of the shoe. So I returned the size 6 and repurchased a size 7. I've walked all day today in these and they were PERFECT!! Such a light weight and comfy shoe, and stylish! I will likely order more of the Air Presto in other colors. I would choose your normal size in this shoe, fits true to size (at least for me).