The ultimate combination of Merino Wool for cold weather insulation and the performance that comes from a perfect fit. There is no other heavy weight sock that can make this claim. If there were we would have made it! This sock is loaded with 100% Merino Wool on the inside against your foot so all you feel is comfortable and dry. Features: Heavyweight full foot cushioning for warmth and protection. Durable Nylon exterior for extended wear. Mid-calf height to work well with hunting boots.