Replace the old lens of your Flight Deck XM with the Oakley Flight Deck XM Replacement Lens. F3 anti-fog coating on the lens stops the formation of fogs and gives a clear vision. The lens is molded by injecting polycarbonate at the right amount of pressure to make a sharp contour of precise optical geometry. The patented High Definition Optics technologies used in making this lens meets and exceeds the testing standards for lens and glasses.