A bold design, smart details, and advanced lens technologies add up to make the Edge defiance wayfarer style Z87+ safety glasses a serious contender for your new favorite pair of sunglasses. Optional polarized lenses, available fog-proof technology, and an anti-scratch coating provide unflinching optics to keep vision clear in virtually any environment. And with flexible, yet durable frames, you won't have to worry about breaking them all while enjoying the lightweight comfort that comes standard with the defiance. From the river to the job site, the defiance delivers impact protection, comfort, and glare-reducing features. When light strikes a horizontal, reflective surface, such as water, snow, or a vehicle's hood, it bounces off horizontally. Polarized lenses arrange the light entering the glasses in a vertical manner while absorbing excess glare-causing horizontal rays. All of our lenses are made of shatter-resistant polycarbonate. Our 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. Aqua precision lenses maximize visual clarity and contrast in bright light conditions. Instead of using a traditional "layering mirror on smoke" lens process, anti-reflective ions are infused into a clear lens resulting in a mirrored look and maintaining pristine clarity. We developed a permanent anti-fog technology in 1993 and named it vapor shield.