This Lorpen 75% Merino Wool over calf sock, is designed to keep you warm and dry on very cold days. Knit with 10% Lycra - these socks stay up and won’t creep down inside your boots. Flat toe seam ensures no irritation after long hours of walking. The multiple density knit enhances the overall performance by giving you more cushioning on the sole and a lighter more open knit on top.