I've been wearing black socks made by Gold Toe for at least 15 years. They last a long time and are thus an excellent value. I wear these year round. I can wear wool or synthetic socks, and I dislike cotton socks the most. I look dorky when I wear these with sneakers or sandals but I'm quirky anyway, so it's OK.
http://www.macys.com/catalog/product...5-_-58-_-MP558
I think they're 15% nylon which makes them durable and retains the good qualities of wool.