10128 is a wool sock with comfortable fit. The terry knit throughout the whole sock increases air volume, which in turn acts as an insulator and keeps the feet warm. Reinforced heel and foot pad, and anatomically shaped for the right and left foot for an extra good fit. Can be machine washed at 40°C, and tumble dried. Oeko-Tex certified. Material: 74% Merino wool, 24% PA, 2% Lycra.