The Op-d-op II's patented push button technology makes it the most comfortable face shield ever created. Push down on the buttons to adjust the visor arms in or out and the visor instantly becomes smaller or larger. Once you find your size, you're good to go. Compared to other Op-d-op styles, the Op-d-op II has the most space between your face and the shield, making it ideal in settings where loupes and lights are worn on a regular basis. • FULLY ADJUSTABLE WITH THE PUSH OF A BUTTON • EXTRA WIDE AIR VENT FOR MAXIMUM AIR FLOW • FLEXIBLE SKI ARMS ELIMINATE PRESSURE POINTS • TINTED MINI-SHIELD REDUCES OVERHEAD GLARE • MORE SPACE BETWEEN YOUR FACE + THE SHIELD • FITS OVER GLASSES, LOUPES + LIGHTS • REUSABLE, REPLACEABLE SHIELDS + FOAM BUMPERS