Smith Sport Optics sets the standard for high performance sunglasses, goggles and helmets. Smith innovations include the patented Regulator lens ventilation system, distortion-free Tapered Lens Technology, and the versatility of the Slider Series. Smith Optics is synonymous with innovative and top-quality products in the eyewear, goggle and helmet markets. A boost for your eyes, these ready-to-wear polarized bifocal sunglasses are perfect for reading fine type or trying on a new fly. With +2.0 or +2.5 magnification options, each model has a magnifying segment that is 25mm wide and placed low in the lens to avoid impacting your long-range field of view. Medium/Large fit+2.0 & +2.5 MagnificationPolarized Polycarbonate Lens MaterialFrame/Temple: Grilamid TR906 Base Lens CurveFrame Measurements 60-19-120