Every Flak Jacket accessory lens features Oakley Hydrophobic, a permanent smudge-resistant coating that repels water, oils and dust. High Definition Optics (HDO) maximizes clarity with patented innovations like XYZ Optics, a geometry that maintains razor-sharp vision at every angle of view. Their durable Plutonite lens material offers superior impact protection and filters out 100% of all UV rays, not just UVA and UVB. Fits standard and Asian fit Flak Jacket frames.