Gargoyles Stance sunglasses provide serious protection, durability and comfort for serious business. When your job puts you in harm's way, your eyes simply can’t be part of that equation. Stance meets ANSI Z87.2+ specs, which means superior protection, crystal clear optics, and the option of adding prescrition lenses. It also meets the military’s MIL-PRF-32432(GL) specification for high velocity and high mass impact protection. That's the kind of detail you don't have time to worry about and with Stance, you won't have to. Every component has a specific job to do: Gargoyles G-Loc hinges mean your frames are open or closed, no in-between; vented, the ribbed nosepad allows for better airflow; Gargoyles anti-reflective and Tri-Tech oleophobic treatments reduce harsh light and is water and smudge resistant, making cleaning easier; lastly, the TR- 90NZZ full rim protective wrap frame with co-injected browbar means unbeatable comfort and durability. Stance is proof that you can look good, be comfortable and stay laser sharp at the same time. This is performance tactical eyewear. It’s always working.