Thermal lenses compatible with the SnowHawk Goggle System. The thermal gasket lens has an insulated barrier between panes to keep the cold exterior from infiltrating. 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.  Tested under EN 166 standards, Revisions OcuMax Plus is proven to last longer than competing anti-fog solutions by a factor of 10-20 times, is chemical-resistant and prevents scratches, streaks and smears. MIL-PRF-32432A clause 3.8.4.2 Ballistic fragmentation characteristics Class 2 and 3 goggles ANSI Z87.1-2015 clause 6 Impact-Rated Protector Requirements (Z87+) STANAG 2920 (Edition 2) V50 = 856 ft/s (261 m/s) EN 166 clause 7.3.4 Protection against high speed particles at extremes of temperature (