Fuse Lenses for Smith Optics Lowdown XL Plastic frame Plastic lens Polarized lenses Lens width: 60 millimeters Fuse G15 Polarized Lenses. Green/Grey view. G15 was first developed for military pilots. Cuts through blinding glare. Enhanced depth perception. Completely block harmful UV rays, providing 100% UV protection Fuse Force scratch resistant hard coating Lens Category 3, Ideal for Bright Light Custom Made to easily interchange with your current sunglasses.