Fuse Lenses for Prada SPS 53N Plastic frame Plastic lens Polarized lenses Lens width: 66 millimeters Fuse Photochromic Lenses. Starts out light grey and darkens in sunlight. Non-polarized lenses Completely block harmful UV rays, providing 100% UV protection Fuse Force scratch resistant hard coating Lens Category 1-3, Ideal for Indoor/Outdoor Use Custom Made to easily interchange with your current sunglasses