The Serengeti Nuvino Polarized Sunglasses with Advanced Polarized Surface Technology are a great all around sunglass. They have rimless lenses for unobstructed vision at any angle. The lenses are polarized for glare elimination and photochromic to automatically get darker in bright sunlight. The frame is made of very durable but light nylon with rubber nose pads and temple tips for comfort. Key Features:Nylon frame is light and durable Rimless lens style offers outstanding vision Frame has rubber nose pads and temple tips for comfort Polar PhD NXT lenses weigh less than polycarbonate and MUCH less than glass Photochromic lenses automatically darken in bright light Polarized lenses eliminate glare Lenses block 100% UV (ABC).