I wear a size 8, sometimes 8 1/2. I saw reviews here and at Zappos, some of which said that the boot had a snug fit if you order it in your size, and since they don't make half-sized boots, I opted for the size 9. A bit loose,and wide through the toe box, but should be no problem with thick socks. I have high arches and I'd say the arch support is "okay"...I might consider adding an insole, which would also improve the fit. These shoes aren't meant for treading through heavy snow, or snow sports--they'll definitely leak, but for general city use, they are comfortable, lightweight, warm, and cute. I live in Chicago, and found it amusing that these boots have the same name.