We are constantly working to improve the performance of our products and this is our latest technology. With enhanced contrast you will be able to see everything with perfection. Bullet proof and shatter safe lenses with a new developed hard coating for longer lifetime. 100% polarized and UV protected.So what are you waiting start enjoying your lifestyle with razor-sharp vision and relaxed eyes with leech premium+.All Leech sunglasses feature patented Polarized Premium Sight Lens technology, a breakthrough in quality and technology, delivering great polarizing efficiency and perfect optics. Leech sunglasses also provide 100% protection from UVA, UVB and UVC rays. Scratch-Resistant Coating Through all the advancements in eyeglass lens coatings, eyeglass lenses are still not scratch proof not even glass lenses. However, Leech eyeglass lenses are treated front and back with a clear, hard coating do become much more scratch resistant.Ultraviolet Treatment UV400.Keeps the sun's UV rays from harming your eyes.100% UVA, UVB and UVC Protection.