Designed for smaller faces, Oakley's M Frame Hybrid S eyewear features an exclusive Polaric Ellipsoid lens geometry for enhanced optical resolution and a Plutonite lens that effectively blocks 100% of UV and harmful blue light. The keel of the M Frame is articulated with hinges and sloped for a tight float across the bow. The O Matter frame is a flexible synthetic design for sustained durability and the interchangeable lens system is ideal for fluctuating light conditions.