I purchased these and Browning Hosiery Men's Big Bertha Merino Wool Sock to compare. I really like both socks, but the Brownings are the standouts for warmth and fit. I have a size 12 foot, so I'm right on the border for the x-large size. Forced to choose, I will take a sock that is a little large than one that is a little small. Even though the x-large is supposed to start at a size 11, it still feels a bit large for my foot. The reinforcement and venting do help with the bulk of the sock, but it still feels a bit on the large size.