The 3M™ Speedglas™ Crown is a part of 3M's welding safety products line that helps increase welding performance.The 3M Speedglas Crown 06-0700-82 is used with the 3M Speedglas Welding Helmet 9100 FX or 3M Speedglas Welding Helmet 9100 FX Air Complete Welding Helmet Assembly to provide protection to the user from welding spark and spatter on the top portion of the head and neck.