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Introduced in 2006 the tough SI Ballistic M Frame 2.0 Tactical Sunglasses were designed more for battle than for beauty. The most obvious change from the regular M Frame is the thicker more rugged frame. The wide elbows past the temple hinge were brought in to better accommodate helmets or other headgear but the temples also became stronger opting for a more vertical profile. The ridges not only enhance the overall integrity but also lend a bit of styling to the rugged frame. The Ballistic 2.0 lenses made of pure Plutonite are a tad thicker as you might expect given the MIL-PRF 31013 rating. As if s genius wasnt already on full display here their patented DedBolt clip was designed to literally lock in the ballistic lens to prevent separation during impact. SI Ballistic M Frame 2.0 Tactical Sunglasses exceed ANSI Z87.1 Industrial Standards for high-mass and high-velocity impact protection and are stamped for industrial and military safety compliance. The Z87.1 stamp can be found near the top edge of the lens above the nose bridge hidden by the brow of the frame. Plutonite lens material blocks 100% of all UVA/UVB/UVC and harmful blue light Full compatibility with PASGT CVC and MICH helmets Full compatibility with helmet-mounted night vision devices Distortion-free optics via patented Polaric Ellipsoid lens geometry that minimizes refraction Extended upper/lower/lateral/ viewing fields via Polaric Ellipsoid geometry Maximized comfort of ultra-lightweight design 1.05 oz. total weight Secure fit even under wet conditions via hydrophilic Unobtanium at all contact points Convenience of easy lens replacement with no need for tools.