The Seal Skinz Mid Weight Knee Length Sock is a 100 waterproof windproof & breathable sock that that has a soft insulating merino wool lining to offer extreme weather protection & comfort making them ideal for outdoors enthusiasts & those who work in the great outdoors These knee length socks offer maximum coverage have an elasticated ankle & insteps to offer support & an extremely comfortable close fit to prevent movement & discomfort if you are exposed to wet weather conditions The Seal Skinz waterproof socks use a patented 3 layer technology with a tough durable outer fabric a specialist waterproof & breathable membrane & a high wicking anti-microbial Merino wool lining combined in order to offer you the very best in weather protection & comfort so you can continue to enjoy your outdoor activities without worrying about getting wet feet