Built for the coldest days of the season, our XKG Heavyweight Merino Socks are the thickest and warmest sock in our line-up with the most cushioning. Available in boot and over the calf heights, this sock works well with all boot heights while keeping your feet comfortable and dry everyday in the field. Features 1) Merino wool wicks moisture and dries quickly to keep feet comfortable. 2) Boot socks average 11 inches and Over the calf average 13 inches from heel to cuff. 3) Flat knit toe seam for additional comfort. 4) Arch support engineered to embrace the foot, ensuring the sock remains securely and comfortably positioned. 5) Heavyweight socks provide cushioned comfort and warmth in cold temperatures and are breathable to help stay dry during high activity and weather changes, allowing you to stay comfortable. Specs 60% Merino Wool, 38% Nylon, 2% Lycra Natural Odor Control Thermal Regulating Cushioned for Comfort Moisture Wicking Boot and Over the Calf Heights Sizes M, L, XL