Style:Alto | Color:Mirrored Silver From Blue Gradient to Mirrored Silver, choose the look that best fits you with the Bose Frames Lens Collection. These interchangeable replacement lenses are easy to switch on your own. Just follow the simple instructions included in the box to swap them with your current Bose Frames Alto lenses. Each pair of lenses blocks up to 99% of UVA/UVB rays — with polarized options available. And they’re forged from premium materials to ensure they won’t easily scratch or shatter. 838211-0010A