Xman,

I wear a size 7 (US shoe size) and have two pairs of the Diamond Ribbed Knee High Socks from Sock Dreams. They fit me well right out of the box.

Although the Sock Dreams website states they will fit up to a size 10, I would be surprised if the socks fit on feet larger than a size 9. The top portion of the socks fit my relatively thin calves, but there isn't enough room for large calves.