Revant Polarized Replacement Lenses for Spy Optic Dirk Stealth Black 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