Sorry to break it to you, but regular cotton socks aren't warm enough to stand up against freezing winter temps. The warmest socks for extreme cold, on the other hand, use heavier fabrics that provide adequate protection against the cold and keep heat inside.
When choosing a pair of the warmest socks for winter, look for insulating materials like acrylic or Merino wool in the fabric makeup. Merino wool is known to be really warm, and since it's finer than other types of wool, it's also more breathable and won't feel itchy on your skin. You'll often find wool fabrics combined with other materials — like nylon, polyester, or spandex — to add some stretch or extra moisture-wicking capabilities in the best socks for skiing, too.
To help you find the best socks for winter, I've compiled a list of the warmest socks for extreme cold, below. Made from a variety of thermal fabrics, some of these options offer additional features, like battery-powered heating or targeted foot cushioning for added comfort. No matter which pair you choose, you can count on them to protect your feet from the elements. Couple your new socks with waterproof winter boots, and you'll be all set to face frigid weather.