Serengeti Lamone 555nm Polarized Sunglasses (S-Flex - Tannery Collection) plastic frame Composite lens Non-Polarized Photochromic glass 555nm lens manages yellow and green light transmissions to cool and relax the eyes which constantly lightens and darkens throughout the day Gunmetal Black sunglass frame made from Titanium. latest in photochromic technology Designed to best fit Medium faces