LA Light Adjusting lenses with a  Matte Black Frame. Eyewear meets ANSI Z87 high velocity impact and high mass impact requirements. Patented facial cavity seals. Includes removable, soft foam Facial Cavity Seals, locks onto lightweight frames to help protect your eyes from wind and debris. Fits head sizes medium to large. The most convenient lense darkens based on the amount of UV radiation present. As the sun becomes lower on the horizon (early morning, late afternoon or dusk) the atmosphere filters the UV radiation and lenses transmit more light to the eye. Because of the optical clarity, these lenses are ideal for riding from dusk into the night. Many riders chose the convenience of having a single glass with LA Light Adjusting lenses for both day and night riding.