With its soft geometric design, SHELBY is a tempered frame. This design benefits from a metal construction with a thicker top on the lens rim and a double brow. The devil is in the detail with the branding engraved at the top of the rim. The Strongest Photochromic Polarized sun lenses. Photochromic lens perfectly adapting to only let the necessary light reach your eyes. Ideal for everyday use and boating activities. Strong and long lasting material for a light yet solid frame. Perfect hinge to adapt on various face size. Lens Technology : Saturn Polarized Photochromic Spectral Control. Lens VLT : 26% to 11%. Lens Color : 555nm Blue. Frame Material : Metal. Hinge : Flex Hinges