Fisherman Eyewear Rogue Bifocal +2.5 Guideline Sunglass Pro Polycarbonate Lenses, lightweight, optical-quality clarity, shatter-resistant Frames designed for all day comfort, with lens tints for optimized light transmission for glare elimination. spring hinge design that reduces temple pressure for comfort fit nylon frame, curved for complete face fit, durable-flexible to withstand extreme encounters Polarized, perfect optical clarity and 100% UV A& B protection in the most demanding light conditions.