TR frame Tri Acetate Cellulose lens Non-Polarized UV Protection Coating coating Lens width: 51millimeters TAC LENS - Lenses are made of Triacetate cellulose(TAC) material. TAC has excellent optical properties can prevent the shrinkage of the PVA polarizing film, and the high-strength surface has scratch resistance.Restore true color, eliminate reflected light and protect eyes perfectly. HIGH QUALITY FRAMES These sunglasses are made of high quality TR90, UV400 protection lenses, reinforced metal hinges, all the details ensuring you a long time using. FASHION UNIQUE DESIGN They are the perfect choice for outdoor activities, such as driving, shopping, traveling, and so on. GIFT IDEAS PACKAGE It is also a gift packaged ready, making it a wonderful yet practical gift idea for friends and family How Do Polarized Lenses Work? Polarized lenses feature a special coating that makes them block horizontally polarized light. They shield your eyes from annoying glares while letting non-polarized light through. This provides better visual acuity compared to standard tinted sunglasses. lens What is Polarized lens advantage? If you want to view objects that are at ground level in bright conditions, then polarized lenses allow you to see with better color contrast since the horizontal light waves are filtered away. The enhancement in color perception allows for better vision clarity compared to the over-exposure your eyes would process if you werent wearing the lenses in the first place. Because your eyes arent working as hard to pick out specific objects in the environment, you can avoid fatigue-related issues like headaches more often thanks to this product. Where are Polarized Lenses Most Useful? Fishing & Water Sports Polarized sunglasses protect your eyes around water by blocking glare reflected off the water surface. Polarized lenses block glares from smooth road surfaces during driving. Make sure you can read your dashboard displays through the lenses Polarized lenses are useful for hiking trips that will take you to exposed places like mountaintops, especially in snowy conditions.