ReVive Optics FLKJXL5-P-M-BKC Replacement Lens For Oakley Flak Jacket XLJ (Polarized Black Chrome Mirror) One pair of replacement lenses in Polarized Black Chrome Mirror for Oakley Flak Jacket XLJ Sunglass cleaning/storage bag included 100 percent Polarized lenses reduces glare, enhance contrast, and provide 100 percent UV protection 16 percent light transmission - neutral view tint Impact resistant exceeds ANSI Z80.3 and EN 1836:2005 standards