VISION YOUTH mirror lenses are made from the toughest, most optically perfect polycarbonate material available. An anti-fog and hard coating is applied and all lenses offer 100% UVA protection. VISION YOUTH mirror lenses have an LTV of between 25% and 38% depending on the tint and mirror colour chosen. The LTV is essentially the amount of light that the lens allows into the glasses. Look incredible with children's mirror lenses that offer excellent optics on the piste or on the trail, and the ultimate in style.