Switchlock Quick Lens Exchange allows for a lenses to be switched out easily for rapid lens exchange. Meets ANSI Z87.1 2015 Optical Standards for Clarity. Patented High Definition Optics (HDO) provides superior optical clarity and razor-sharp vision at every angle. O-Matter stress-resistant frame material is both lightweight and durable for all-day comfort and protection. Thin Stem technology enables compatibility with over-ear hearing protection and comms. Unobtanium nosepad provides a no slip grib even under wet conditions. Speed Jacket case included. Matte Black Frame with Clear, Prizm TR22, and Prizm TR45 Lenses included.