VISION 8, 5, and 3 Lenses are constructed from the strongest and optically perfect, Polycarbonate material available. Anti- fog and hard coat is applied to each lens and all lenses provie 100% UVA protection. The VISION Mirror Lenses have a VLT (visible light transmission) ranging from25% and 38% depending on the chosen tint and mirror color. The VLT is basically how much light the lens lets into the goggle. Look amazing with exceptional optics and stylish Vision Mirro Lens at the track or on the trail. LENS: Optically correct, Polycarbonate material is the strongest and clearest in its class. Integrated tear- off posts allow you to stack as many as 28 tear- offs at a time. Anti- fog coating helps to eliminate condensation on the inside of the lens. Hard- coat is applied to the outer side of the lens to help with durability. Seven key hole locking system ensures a solid fit in the VISION frames. Mirror Lenses available in a wide variety of tints and colors with a VLT range from 25% to 38%.