ISEA/ ANSI Z87.1 + The most common set of accepted Safety Standards on jobsites, manufacturing, and industrial facilities is the “High Impact” (indicated by a + symbol) version of ISEA/ Z87.1. The standard requires very thorough testing in the Optical Clarity, Impact Resistance, and the Coverage aspects of safety eyewear. IMPACT RATED All of their lenses are made of shatter-resistant polycarbonate. This material is lightweight, blocks 99.9% of UV radiation and defends against projectiles or blunt forces with its natural strength. Edge lenses are always designed with the strict safety standards of ANSI, or the stringent MCEPS military requirements, in mind to bring you total peace of mind. ULTIMATE DURABILITY They construct their frames from a virtually indestructible nylon composite. You can twist Edge glasses into a knot. And while they don’t necessarily recommend tying your Edge sunglasses into a square knot, the frames provide more durability than virtually any other glasses on the market. Edge Brazeau Matte Black Frame Polarized Copper Lens Safety Glasses