The Speedglas 9100 Extended Coverage for the crown portion of the headgear is for use with the 9100 complete helmet assembly to help protect the user from welding spark and spatter on the top portion...
The Speedglas 9100 Coverplates are for use with sidewindow versions of the 9100 helmet. These coverplates are for use to cover the shade 5 windows when no additional side light is desired.
The Speedglas Welding Beanie is for use during welding applications to be worn under the helmet to help prevent unwanted debris from contacting the user's head.