Bose Frame Replacements Alto Style Polarized Mirrored Silver New in box , some dust but no wear or scratches to frame. See photos for details Featuring an intuitive design, these replacement lenses for the M/L Bose Frames Alto are easy to interchange on your own. They block up to 99% of UVA/UVB rays—. And they’re forged from premium materials to ensure they won’t easily scratch or shatter. MIRRORED SILVER (POLARIZED)