Bridgedale(R) offers its best hiking sock to endure the challenges of an extreme hike or a leisure trail walk. Summit socks features:; Thick density sock provides protection for the foot from the cold. Heavyweight construction great for winter activities where warmth and cushioning is needed. Boot height cut for added warmth and comfort. Best fit for high volume footwear. Consists of 47% new wool, 34% nylon, 18% endurofil, 1% lycra. Summit Knee socks features:; A tried and true sock that's been tested in the coldest condition. Provides all day warmth and comfort in extreme environments. Excellent thermal protection. Knee length height for high boot fit. Dense cushioning for added leg warmth. Ideal for hiking, running, or biking. Breathable and keeps feet cool. Consists of 51% new wool, 29% nylon, 19% endurofil, 1% Lycra. Machine wash warm, tumble dry low; Available in a 3 pair variety pack.