High-altitude clothing is a niche category of protective textiles that provides protection for individuals in cold, windy, high-altitude environments. Also known as extreme cold weather clothing or ECC gear, it is a requirement for maintaining life and work in mountainous and glacial areas. These clothes are manufactured by using high-tech textile materials like multilayer insulation systems, thermal linings, moisture management membranes, etc. Applications such as Siachen attire are made of rugged fabric, which is designed to trap the heat of the body while allowing breathability and mobility. High-altitude clothing is largely used by defense, trekking, mountaineering teams, etc. The most important items are a high-altitude jacket, a waterproof breathable jacket, and an extreme cold-weather jacket to protect from snow, wind, and sub-zero temperatures, plus high-altitude pants for warming the lower body. Other protective equipment, for example, glacier gloves and rappelling gloves that are designed to protect the hands and offer grip on icy terrain, show how essential high-altitude clothing systems are in providing safety and endurance in severe conditions.