Lenses compatible with ShadowStrike Ballistic Sunglasses. Built to exceed stringent U.S. and international ballistic impact requirements for use in military and tactical operations. Interchangeable, optical grade polycarbonate lenses shield eyes from unexpected fragments, provide 100% protection from harmful UV-A, B and C rays, and ensure distortion-free vision for peak performance. MIL-PRF-32432A clause 3.8.4.1 Ballistic fragmentation characteristics Class 1 spectacles ANSI Z87.1-2015 clause 6 Impact-Rated Protector Requirements (Z87+) EN 166 clause 7.3.4 Protection against high speed particles at extremes of temperature (FT)