I love Frye shoes and when I saw these sandals I had to have them for the summer. I originally got these in 8.5M because most of my Frye boots or shoes are 8M and a few of my older Frye flats are 7.5M. If I stood perfectly still the 8.5M sandals appeared to fit. Unfortunately, when I walked around in the 8.5Ms my big toes would often slide off the edge a bit towards the center. I returned the 8.5Ms for 9Ms, so that I wouldn't be shunned by fashionistas for toe-overhanging. The heel and straps on the 9Ms are a bit loose, but I could put my holes in the strap to tighten the front if it becomes a problem. I have normal width, boney feet with a high arch and a slight bunion and my feet perfectly on footbed of the 9Ms, with only room to spare in front of the toes. I could imagine if you have a wider foot, it would be difficult to fit such a narrow footbed. Wearing them all day left me with slightly sore heels, but if they're anything like Frye boots the heels will break-in after a few wears.