Materials: 30% Wool (Merino), 36% Nylon, 33% Acrylic, 1% Elastane. These Hiking socks are great for hiking, trekking, outdoor adventures, walking, travelling or everyday wear as a thermal sock in the cold season. These hiking socks are developed with mountaineer Rasmus Kragh, the first Dane to climb Mount Everest without the use of supplemental oxygen in May 2019. Available in sizes: US Kids 13-3, Small - US Women 5-7 / US Men 3.5-6, Medium - US Women 8-10 / US Men 6.5-8.5, Large - US Women 11-13 / US Men 9.5-12.5, US Men 13.5-16.0 in 1-, 3-pack. Washing instructions: Wash inside out with similar colours. Water temperature should not exceed 40°C or 105 °F. Do not iron. Do not tumble dry.