The Devold Nansen wool sock is a thick, warm, and comfortable sock in a traditional, stylish design that is perfect for cold mountain tours with overnight stays, but also for winter days in urban environments. The sock is made from 80% Norwegian virgin wool and rarely needs washing. Wool does not promote the growth of bacteria, which prevents odors. - Ribbed knit cuff - Flexible and stable fit. - Tightly knit to prevent bulging.