Prizm(TM) Shooting is a revolutionary lens technology that drammatically enhance contrast and visibility over a wide range o light condition that allows shootersto see clearly, react faster and shoot with confidence. The Oakley SI Ballistic M Frame 3.0 surpasses ANSI Z87.1 Industrial Standards for high-mass and high-velocity impact protection. The M Frame 2.0 additionally meets MIL SPEC MIL-PRF 31013. All lenses are made of pure Plutonite(R), a proprietary material that offers the highest level of optical clarity available in eyewear. It also features a clip that holds the lens and frame together providing more secure support.