From Blue Gradient to Mirrored Silver, choose the look that fits you best from 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 polarised options available. And they’re forged from premium materials to ensure they won’t easily scratch or shatter.