Slide the Kaenon Sequence Polarized Sunglasses on your face and fight back the sun's attack in policeman-meets-fighter-pilot style. These prescription-ready shades cut the glare that muddles your vision while driving and makes your head hurt after a night of heavy drinking. Kaenon's lenses are not glass, polycarbonate, or CR-39. SR-91 is an entirely new material that combines the optical clarity of glass and the lightweight and durability of polycarbonate.