Sealskinz original waterproof sock, with the added protection of Hydrostop™. They designed the Waterproof All Weather Mid Length Sock with Hydrostop™ to keep you dry and on the move in wet and chilly conditions. Wet feet can lead to all sorts of not-so-good things outdoors, including cold and numb feet, blisters, frostbite, and worse. This sock will keep you dry and warm in rain, snow, and mud, through stream crossings, and standing in leaky waders. We're of the opinion that every person should keep a pair of All Weather Mids with Hydrostop™ in their pack—just in case.