2NDS . It doesnand#39;t take an advanced degree to understand how important comfort really is, but these socks got one anyway! SmartWooland#39;s PhD Ultralight Outdoor socks ensure happy feet thanks to their merino wool blend, mesh venting zones and 4-Degree fit system. Available Colors: BLACK, LODEN, SILVER, CHINO, MEDIUM GREY, DEEP SEA, CARAMEL, UNION BLUE. Sizes: M, L, XL.