After spending decades engineering combat-ready gear for the U.S. Armed Forces, Oakley brings the future of protective eyewear to the battlefield with the SI Ballistic M Frame 3.0. It's barely more than an ounce, but this rugged design meets or exceeds the ballistic fragmentation impact standards of MIL PRF-31013, Clause 3.5.1.1, and the high mass & high velocity impact requirements of ANSI Z87.1-2003/2010. Durability is optimized with a new thin stem technology, which also enables compatibility with over-ear hearing protection as well as communication systems. Vision remains clear and unobstructed because of the anti-fog coating. Paired with three optional interchangeable lenses, this optical system gives the ultimate in comfort, compatibility, clarity and convenience. You can count on clarity at all angles rather than just what lies ahead of you.