Porgy Backstage Sunglasses in Black Tortoise by CaddisCaddis proprietary polarized sunglass lenses enhance contrast and reduce 99. 9% of glare without any digital screen distortion. A premium hard coating protects lenses, increasing durability and minimizing scratches. Lenses include a high performance water, dirt, and grease repellent coating for easy maintenance and superior optics. Premium, bio based acetate frame with 7 barrel industrial hinges.