Whether you're working outdoors, hiking, caving, paddling, fishing, trail running, etc., these WETSOX EXPLORE MORE Dry Socks are a great way to add extra warmth and comfort to those feet of yours. Comprised of three layers, these 100% waterproof, 100% breathable socks have a durable outer layer, a semi permeable lining (that lets air in but not water) and lastly, a merino wool blend inner lining. These mid-calf height socks have a durable abrasion-resistant nylon exterior with a reinforced heel and toe. The 45% Merino Wool, 45% Nylon and 10% Spandex blend lining wicks moisture and extends the comfort of these socks. Basically, these EXPLORE MORE socks are warm, durable, comfortable and multi-functional.