Stay dry, warm, and comfortable in these original 100% waterproof, windproof, and breathable mid-length socks from Sealskinz. Crafted with a fine Merino Wool lining, they insulate and regulate temperature for colder weather use. The innovative hydrophilic membrane keeps you dry and cool by repelling moisture at a molecular level. Even in the toughest conditions, the Hydrostatic Head of >20,000mm ensures reliable waterproof protection. Constructed with premium materials, these socks have three bonded layers: Outer Layer: 90% Nylon, 10% Elastane, Middle Layer: 100% Hydrophilic Membrane and Inner Layer: 35% Merino Wool, 35% Acrylic, 23% Polyester, 3.5% Nylon, 3.5% Elastane. Available in 4 colour options: Black/Grey, Grey, Black/Navy Blue, and Grey/Red. Caring for your socks is hassle-free: wash at 40ºC/105ºF, low tumble dry or drip dry. No need for special detergents, line drying, or re-waterproofing. These socks are ideal for cold weather activities such as hiking, trekking, and mountain biking, offering durability and comfort in various conditions. Please note that due to the close bond between sock cuff and skin, over prolonged use, some people may experience minor skin irritation due to the Hydrostop barrier rubbing against the skin. For those who experience any irritation, we recommend that Hydrostop socks are only used outdoors and not for a prolonged period of time.