The 1000 Mile Heat Walk Socks are a heavy weight double layer sock with a high wicking breathable Nilit reg Heat inner layer to offer exceptional warmth and comfort ideal for keeping your feet warm on a chilly day 1000 Mile socks are best known for their double layer construction and these walking socks are part of this range The double layer eliminates friction between your feet and your shoes which reduces wear and helps to prevent blisters These 4 season Heat Walk Socks have a Nilit reg Heat inner layer the yarns of which are made from coffee charcoal and they capture and trap body heat naturally for exceptional warming with excellent absorption and moisture control for dry comfort They are also naturally anti-bacterial and super soft to touch too All over padding including around the leg Achilles tendon ankle bone heel toe and ball areas will ensure that these lovely warm socks offer an incredibly comfortable and cushioned feel while increasing their warming effect and protection Here at OutdoorGear we absolutely love these thermal socks they have combined 1000 Mile s experience in designing fantastic comfortable double layer padded socks with a unique environmentally friendly yarn that offers superior thermo insulation to make an excellent pair of socks for keeping your feet toasty