SmartWool's everyday boot sock has just enough cushioning to keep your feet comfy throughout the day. . Made from pure merino wool, nylon, and elastane. Medium cushion under the foot for extra comfort. SmartWool delivers soft, itch free comfort, even foot temperature, moisture management, and odor control. WOW wool on wool Technology adds more wool in high impact and high wear areas to reduce shock and abrasion offers more comfort and longer lasting merino wool benefits. Knee high height. Machine wash warm inside out, gentle cycle tumble dry low or line dry.