Designed to be worn in exceptionally cold conditions inside mountaineering footwear, the Bridgedale Explorer Heavyweight Merino Endurance Boot Socks are perfect for frosty adventures.__ With excellent overfoot ventilation and carefully considered details including flat toe seams and Fusion Technology that wicks moisture away from your feet.__ Knee length sock to fit smoothly under trousers for all day protection, extra warmth and next-to-skin comfort.__ Full heavyweight cushioning throughout for extra warmth, impact resistance and comfort, while the snug merino and new wool blend will keep your toes warm in the harshest weather.__Moisture managementPerformance fitFlat toe seamOverfoot ventilationY-heelShockzoneThermofit37% Merino Wool, 14% New Wool, 29% Nylon Polyamide, 19% Endurofil/ Polypropylene, 1% Lycra Elastane