Polarization of a sun bifocal requires expensive technology which is why this style is priced higher than most of the sun bifocal line. Some people are willing to pay the price required so that they can enjoy the advantages of a bifocal while having superb polarization of the entire lens. The lenses are also 100% UV protected. The frames are optical quality and so stylish as well. Frame Measurements: 5 3/8" x 2" (temple to temple x height of lens)