Fuse Lenses for Smith Optics Soundcheck Plastic frame Plastic lens Polarized lenses Lens width: 61 millimeters Fuse Fusion Mirrored Tinted Lenses. Deep Yellow Metal Mirror Coating over a grey lens base. Cool, dark grey view. Grey tint gives true color perception. Non-polarized lenses. 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.