These Native Hardtop XP Sunglasses incorporate the latest, state of the art technologies. From proprietary PCC Interchangeable lenses to their custom fitting Cushinol temple boots, every aspect has been painstakingly crafted to exceed the demands the outdoor sports enthusiast. Optical-quality, impact-resistant lenses block 100 percent of the harmful UV light and eliminate glare for sharp, clear vision with increased contrast and depth perception. P.C.C.® lenses provide outstanding vision and protection in any lighting condition. Polarized Reflex lenses provide superior glare reduction and enhanced tyling.