Greg Norman G4221 performance sunglasses feature: Enhanced features for golf, watercraft, fishing and outdoor activities; Full UVA and UVB protection; Oleophobic lens coatings that resist water, moisture and oils for increased clarity; Flash mirror coating for a visually appealing experience; Conforms to all U.S., European and Australian lens standards; Grilamid memory polymer frame material that retains its shape, even under extreme temperature conditions; Each lightweight frame is crafted for a perfect fit and all day comfort; Hydrophillic nose pads and temple tips increase comfort and prevent slipping; Optical quality frames are UV and impact resistant.