The name of the Silver Sokz comes from an actual silver filament which is added to the polyester fibers. This filament is anti-bacterial and anti-fungal to keep your feet healthier when they spend long period of times wearing boots. We love the side benefit that your socks stay fresh longer, with less odors at the end of a long day. The Meryl SkinLife Microfiber is a high-tech fiber which keeps your body temperature constant. Wear these socks in warm and cold weather and you will be comfortable. Distinguishing features include the anatomic design. Each pair consists of a left sock and a right sock, marked on the toes, so that they follow the exact shape of your foot, including around the ankle so they do not bunch like tube socks. They also include padding around the toe with flat seams, around the heel, and along the front to prevent chafing from the boots. They are thin everywhere else for a better fit inside the boots. The soft elastic around the top will keep them in place. Air channels along the front help with air circulation. Available in tall (over the calf) or short (under the calf). Black/Gray.