HDO eliminates optical distortion so you can now keep your focus on the path ahead of you and see it with perfect clarity. These replacement lenses meet MIL PRF 32432 Ballistic Impact Standard and ANSI Z87.1 Optical Clarity standards, which guarantees maximum protection against any kind of hazardous impact. It specifically fits the Oakley SI M Frame Alpha & SI Halo models and is designed to reduce distortion so that you experience a clearer view with precise details. With its lightweight design, this lens offers comfortable wearability without compromising performance or protection.