VISION YOUTH Mirror Lenses are constructed of the strongest and most optically perfect, Polycarbonate material available. Anti-fog and hard coat is applied and all lenses provide 100% UVA protection. The VISION YOUTH Mirror Lenses have a VLT between 25% and 38% depending on the chosen tint and mirror color. The VLT is basically how much light the lens lets into the goggles. Look amazing with the Youth Mirror Lens that offers excellent optics at the track or on the trail, and the ultimate in style.