Ray Ban RB4255 Chromance Sunglasses Purple Mirror Chromance BrownThis rimless style is ensuring maximum lightweight and comfort combined with a sporty masculine design. The RB4255 also features the brand new Chromance lenses, the innovative and highly performing newest lenses in Ray-Ban family.Chromance lenses fine-tunes light, making everyday colors brighter, clearer, and more extraordinary. The special six layers antireflection treatment help maximizing contrast, granting more details in texture and contour. Chromance lenses also eliminate reflections and glare with polar filters, ensuring the best clarity in vision.