The Ray-Ban RB3548N Hexagonal Evolve Photochromatic Flat Lenses Sunglasses is the combination of a circle and a square shape frame that is perfect for both women and men. The new hexagonal round metal shape features thin coined profiles with super thin temples and flat Evolve photochromatic lenses. The Evolve photochromatic lens treatment allows a gradual change of lens color from a lighter shade to a darker shade within three minutes when exposed to UV light outdoors. No other light will result in the color change. Within five minutes of stepping back inside, the Evolve lenses in the RB3548N will gradually change back to the original color! Made from high-quality glass, Ray-Ban lenses are prescription ready. Ray-Ban is the world's most iconic eyewear brand and is a global leader in its sector. Every model in the Ray-Ban collection is the product of meticulous, original styling that translates the best of the latest fashion trends into an ever-contemporary look for millions of Ray-Ban wearers around the world. From the early Aviator style that emerged in 1937 to the introduction of the classic Wayfarer in 1952, Ray-Ban is a brand that embodies America and adventure, great cities and wide-open spaces, heroism, individuality, and authenticity. Starting with a silver screen debut in 1961, Ray-Ban sunglasses have appeared throughout hundreds of films and have been a favorite on the Hollywood scene for years, both on and off the screen. With timeless and imaginative styles, Ray-Ban consistently blends high-tech design, lenses, and materials. The collection remains true to its classic heritage while continuously evolving to meet today's fashion demands.