Lens and body offer protection against medium energy high-speed particles at 120 m/s (270mph) and protection against high-speed particles at extremes of temperature, The optical qualities of the lens comply with the requirements of optical class 1 (highest), The body offers protection against large dust particles, liquid droplets and molten metal, The lens also offers protection against molten metal Moulded-in ventilation for dust liquid, molten metal and hot solid protection Wide elastic headband for improved comfort.