HDO High Definition Optics (HDO ) gives you maximum clarity and impact resistance with virtually distortion free vision at all angles and 100% UV filtering. Prizm Snow [Select Colorways] Prizm is a revolution in lens optics built on decades of color science research. Prizm lenses provide unprecedented control of light transmission resulting in colors precisely tuned to maximize contrast and enhance visibility. Dual Vented Dual vents and F3 anti-fog coating keeps your vision crystal clear. Anti Fog Dual vented Plutonite lenses with F3 coating, which allows the inner ballistic lens to absorb a minimum of 2 ml of moisture. Plutonite Lens Material Impact resistant, blocks 100% of UVA, UVB, UVC, and harmful blue light. Only Plutonite stands up to Oakley's performance standards.