ENDURANCE ACCESSORIES: The Runton, featuring Hydrostop, is a mid-length sock designed for a range of cold-weather activities such as hiking, trekking, and mountain biking. Its waterproof and breathable qualities make it an essential accessory for outdoor enthusiasts. The Hydrostop barrier effectively prevents water from entering, ensuring feet stay dry and comfortable. DURABLE: Comprising a robust outer layer of 90% Nylon and 10% Elastane, the Runton sock is built for the colder months. Its middle layer includes the AQUASEALZ waterproof membrane, while the inner layer blends 35% Merino Wool with other materials for warmth and moisture-wicking. Suitable for all cold weather conditions, it's a versatile addition to any outdoor wardrobe. THE VERY BEST: While details on colour variations are not provided, the Runton Waterproof Cold Weather Mid Length Sock with Hydrostop is designed to meet the needs of a wide range of outdoor activities. Its materials and construction ensure durability and comfort in various conditions. EASY CARE: Maintaining the Runton sock is straightforward - wash at 40ºC/105ºF, tumble dry on low or drip dry. Avoid dry cleaning, ironing, or bleaching to preserve the integrity of its waterproof and insulative properties. Please note that due to the close bond between the 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 be used outdoors and not for a prolonged period of time.