Fuse Lenses for Electric Knoxville XL Plastic frame Plastic lens Non-polarized lenses Lens width: 61 millimeters Fuse Gradient Grey Tinted Lenses. Dark Grey at the top and fades to clear. A popular choice for high-end or fashion frames. Grey tint offers true color perception. Non-polarized lenses Completely block harmful UV rays, providing 100% UV protection Fuse Force scratch resistant hard coating Lens Category 2, Ideal for General Use Custom Made to easily interchange with your current sunglasses.