Military Tactical Dark Black HD Replacement Lens for Oakley Flak Jacket XLJ LENS COLOR: Black ONYX - A dark gray lens with a stealth mirror coating designed to conceal the wearers eyes. UV PROTECTION: Yes, 100% UVa, UVb & UVc harmful light protection. These are the suns rays known to cause permanent eye damage and cataracts. LIGHT TRANSMISSION: -8% or CAT 3, This lens is best used in Bright light conditions and provides a nice even tint. IR REDUCTION: Yes, IR or Infra-red rays cause eye fatigue and dryness. Our lenses dramatically reduce these rays for longer lasting comfort. IMPACT RESISTANT: Yes, These lenses are tough. A true optical quality polycarbonate.