The Womens Heat Walk Sock from 1000 Mile uses the unique Nilit Heat yarn from it's inner layer to warm the wearer for maximum comfort & performance during the cold temperatures. All-over padding increases warmth & protection for the foot & leg whilst the wicking, breathable inner layer provides a sweat-free sensation for maximum comfort all day long. Top venting on the foot allows the foot to breathe & helps maintain an even temperature. Double layer construction eliminates friction between foot & shoe, reducing wear & helping to prevent blisters. Captures body heat naturally for exceptional warming. Excellent absorption & moisture control for a sweat-free sensation. Natural anti-bacterial properties & a powerful deodorising effect. Environmentally friendly yarn–created with coffee charcoal which makes use of the natural surplus from coffee bean shells & integrates into the nylon fibre for a natural insulation. This product contains Merino Wool: Merino wool is one of softest types of wool available & is perfect for regulating body temperature. The wool provides warmth without overheating the wearer & it's moisture wicking properties combined with being slightly moisture repellent allow the wearer to remain dry.