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Product Description These lightweight and convenient shade rated welding lenses feature an Over-the-Glasses style fit for both convenience and function. The clear, scratch-resistant polycarbonate lenses are encased in a durable frame and resist impact and absorb 99.9 percent UV rays. 145mm wide, single-piece, polycarbonate lens is available in a shade 3.0 and 5.0 rating, and adjusts easily to three positions. Molded-in side shields and brow guard add extra protection above and around eyes. Temple Length adjusts to four different lengths to provide a comfortable fit for just about anyone. Temple ends have a patented Duo flex feature for improved comfort behind the ears. ANSI Z87.1-1989. Csa Z94.3. From the Manufacturer The Uvex Astrospec OTG 3001 is an economical alternative to expensive prescription frames. Each model features Duoflex comfort cushion temples. Designed to fit over prescription glasses, the Uvex Astrospec OTG 3001 is a comfortable and practical option to Rx frames or bulky, cumbersome goggles.