“Easy Grip-Easy Turn” rotation allows instant loosening and tightening of the headgear ,Oversized soft rubber adjuster dial is easy to find and grab even when wearing gloves ,Patented “quick-fit” rear swivel headband quickly adjusts the suspension to the user’s head for superior comfort, convenience, and productivity ,Easy to adjust pin-lock upper adjustment band allows proper positioning of face shield ,For Quad 500 Face Shield