This shoe runs large. It is sized in metric sizes. A woman's 11 is a 42. When shoes are sized in metrics, I wear a 41, so the shoe is rather big on me. Since it was cheap, I'm not bothering to return it and I'll wear it as is... Had I known, I would have gone down a size. The arch is decent for such a flimsy shoe. The canvas is really thin and more clothing fabric like than shoe like. It's just an okay, hanging around the house kind of shoe. More slipper like than shoe like...