Megol nose pads.  Monel metal frame.  Spring hinges.  Photochromic Polarized lenses contain special fast-response molecules that after when exposed to natural sunlight.  The lenses darken or lighten appropriately to the suns intensity.  The result is a single lens that adapts to a wide array of light conditions.  Peppers Photochromic Polarized lenses are developed to offer higher light transmission, allowing use in all conditions from early dawn until sunset while enjoying improved contrast through the filtering of scattered blue light (visual noise) to improve visual acuity.  All Peppers Photochromic Polarized lenses move 78% to 15% Visual Light Transmission at the rate of 25 seconds.  Lifetime warranty.  No prescription available.