Made from Noryl®, the same material used in our welding helmets, High Performance faceshields are stronger, more durable and more heat resistant than ordinary faceshields. They contain our exclusive Channel Grip System, which mounts windows and locks them in place in a deep recessed channel to form a perfect seal from dust, dirt and debris. The F500 has a broader, deeper 7" crown protector that provides an extra margin of protection when harsh working conditions require it.