Wiley X ZAK Black Ops Tactical Sunglasses feature extra-thick frames for peripheral protection glare and impact. These tactical sunglasses are inspired by the shadowy realm of covert operators. Wiley-X Black Ops Sunglasses are made for elite-level military personnel, law enforcement officers, and hard-core shooters. The Wiley X Black Ops Zak Sunglasses fuse a stealth design with the High Velocity Protection you've come to expect from Wiley X. These Wiley X sunglassses are built with a stealthy design and shatterproof Selenite polycarbonate that stand up to the ANSI High Velocity Impact Test. ANSI requires these military-grade sunglasses to withstand the impact of a .25 inch diameter steel ball fired at a speed of 150 fps. Wiley X repeats this test 20 times from different angles, aimed at different areas of the lens, to make sure their tactical sunglasses are practically indestructible. And to earn the coveted ANSI Z87.1-2003 (High Mass Impact Test) certification, these Wiley X Black Ops Zack Glasses must withstand the weight of a 1.1 lb pointed projectile drop from a height of 50 inches. The sunglass lens must remain intact and no part of the frame can be detached. The result of all this testing - a tactical sunglass that will stand up to anything you encounter. The finishing touches include T-Shell scratch Resistance, Slick Surface spotting prevention, and 100% UV protection.