Ergonomic temple for comfort fit. Temple tip locking catch. Temple ratchet adjustment. Hard coated polycarbonate lens. Anti-fog and anti-scratch. Soft nose pad. OTG lenses gives good fit for prescription spectacle wearersErgonomic temple provides comfortable, self-adjusting and a more secure fit to the users head. The swaying ergo temple pieces will spread the pressure evenly across the users temple area.Temple ratchet adjustment works closely with the ergo temple to help the user wearing the product with different pantoscopic angles, suitable for all head shapes. Conform to EN166:, Optical Class:1, F T - (Low impact energy at extreme temperatures), 5-3.1 - UV Filter, K - Scratch Resistant, N - Fog Resistant