I'm glad I got these cozy socks. They're thick and super warm, and I especially wanted them due to the alpaca content, as alpaca really makes winter socks warmer than regular wool. These are the second pair I got because I liked the first pair I had purchased recently. I wear 6-1/2 size shoes normally (7 to 7-1/2 in winter boots in order to fit a thin wool sock with a thicker wool sock). These medium socks are a bit long, but from lots of experience with wool socks, they can shrink at least a little over a few winters. I'd rather have them a tad long than too short, which the small size socks would have been. I have a feeling these will be my favorite go-to winter socks.