NYX Sport Vision PRO Z-17 Series Sunglass with Z87.1 Safety Rating, White-Black Frame/Yellow Luminator Safety Lens, Medium Pro Z-17 safety rated styles offer lightweight impact-resistant polycarbonate lenses meeting Z87.1 safety standards and 100% UVA UVB protection Torsion flex technology combine co-injection frame and adjustable nose piece with 4 way tuning to provide soft firm fit 7.5 curvature that provide further wrap-around protection and side sun-shielding glare Includes zippered hard case and micro-fiber pull string cleaning pouch Available in prescription