These men's socks made by Goodhew in the U.S.A. come in several styles and three different blends. They all use merino wool: the finest wool that comes from sheep, which has very good natural temperature control and moisture management (it wicks away sweat).
The Milan and Bergamo II types are also both dress socks, with wide ribs (the latter is shown below; but they look very similar). The Milan is a 66% merino wool, 29% nylon, 5% spandex blend, while the Bergarmo II consists of 75% merino, 22% stretch nylon and 3% spandex. The nylon in these socks is derived from bamboo, which give it odor-eating anti-microbial properties.