New SEEK OPTICS Replacement Lenses Oakley FLAK JACKET XLJ - Polarized Black composite Polarized Color: Polarized Advanced Black Fits Oakley Flak Jacket XLJ, 100% UV400, Polarized, Neutral - Protection Index: 3 Versatile lens tint with great color perception and anti-fatigue qualities perfect for sunny environments. Best for medium to bright light conditions. Perfect for driving, baseball, tennis, football, soccer, water sports, and all other outdoor activities IMPACT RESISTANT - Exceeds FDA Safety Standards, ANSI Z80.3 and EN 1836:2005 Standards. Seek Optics hard-coating uses Wrap-Coating Technology. The surface of our lenses has a super-hard wearing protection layer and enhanced lens surface hardness which extends the service life of the lenses. Seek Optics hard-coated lenses with our wear and tear resistant surface do not easily scratch or crack. SUPERIOR LENS TECHNOLOGY: The entire line of Seek Optics lenses use an advanced Nano-DSX technology developed in Japan. Using a special hard coating, and a double-sided dip-coating method, we achieved an excellent anti-oil prevention (oleophobic) which makes our lenses extremely easy to clean.