All our frames are made from durable and flexible nylon, a polymer that is known for its light weight and relatively little “aging” (many plastics degrade over time, especially from exposure to sunlight). It is also skin-friendly and one of the lightest materials available. Our lenses are made from various different materials. Most of them are PPL-75, our proprietary lens material that is known for its extremely clear visible spectrum, and therefore ideal for eyeglass lenses. Our High-Contrast lenses are made from CACCHU, a patented polyurethane we developed to provide the ideal balance of visual clarity and durability. But the secret is in how we make these lenses. Our patented iodine filter is laminated between two very thin lens discs. Additional coatings make our lenses extremely durable, and quite frankly some of the best polarized lenses in world.