Before buying these boots I tried them in various sizes at a Skechers' oulet store. I normally wear a 9 1/2, but the 9 felt perfect. Still, I went with the 9 1/2 thinking of the thick socks I'd wear. The boots are warm enough, so you don't really need to wear heavy socks. Now, even when I'm wearing two pairs of thick socks, the boots come off every step I take, which makes it difficult to walk fast and/or long distances. I live in Madrid, so I do a lot of walking. But, then again, this was my bad.

They run big. Just get your usual size (or half size down) and you'll have plenty of room for winter socks.