Revant Replacement Lenses for Electric Knoxville Polarized 1 pair lenses - Precision-cut and guaranteed to fit your Electric Knoxville frame Polarized lenses reduce glare, enhance contrast, and provide 100% UV protection Impact resistant (exceeds ANSI Z80.3 and EN 1836:2005 standards) 365-day manufacturing warranty and 60-day money-back guarantee Stress-free video installation guides available 100% UV Protection LockFit Technology High Impact Resistance (meets ANSI Z87.1 high mass, high velocity impact standards) Advanced Protective Coatings Taper Corrected Injection Molded High Definition Clarity Specialized Lens Tints Available in Polarized and Non-Polarized 100% UV Protection LockFit Technology Standard Impact Resistance (meets ANSI Z80.3, ISO 12312-1:2013, &amp; AS/NZS 1067:2003 standards) Anti-scratch Protective Coating 100% UV Protection LockFit Technology Standard Impact Resistance(meets ANSI Z80.3, ISO 12312-1:2013, &amp; AS/NZS 1067:2003 standards) Anti-scratch Protective Coating