I usually wear a 7.5/8 and ordered the size 7-8. They fit perfectly. I've had them for a few months, and while they're still comfy, the seam ripped all along the edge of one, so it has a big mouth. But I do like the Muk Luks when they're fairly priced, so I ordered another pair. I figure for $20, a good 3-4 months worth of wear was pretty good.