Waterproof and Breathable: Engineered with a Porelle membrane that prevents water penetration while allowing moisture vapor to escape. Material: Mid-calf length socks featuring a merino wool terry loop pad for warmth and comfort. Function: Suitable for trekking, hiking, and other activities in wet or snowy conditions. Fit: Designed to be close-fitting and comfortable within hiking boots. Antibacterial: The merino wool provides natural anti-microbial benefits. Intended Use: Suitable for trekking, hiking, and other arduous activities where keeping feet dry and warm is important. Design: The socks have a seamless design, cushion from heel to toe, and are antibacterial. Sizing: The size "L" indicated on the box corresponds to European sizes 43-46, UK sizes 9-11, and US sizes 9.5-12. Care Instructions: To maintain the waterproof membrane, the socks should be drip line dried and kept away from direct heat sources like radiators or irons.