The NYX Pro Z17 Series follows the same “single lens” design found in the Carbon and Carbon Pro Series styles with a few changes. For one, the nose piece is adjustable. This gives the user the ability to “custom-fit” their frame to their nose or face contour for a perfect fit. Secondly, the frame is heat fused binding proprietary non-slip elastomers with a nylon Grilamid TR-90 polymer. This gives the frame flexible durability and provides a lightweight style for active users.In addition, the Pro Z17’s has several available interchangeable lenses, each holding a 7.5 curvature that provides further wrap-around protection and side sun-shielding glare.It is truly a design fit for the active individual who seeks a better performance sunglass in a fashionable modern design.Packages Include1 Frame (Color of your choice)3 Polycarbonate Lenses (Different colors based on selected package)3 Nose Pieces1 Soft Micro-Fiber Poly Bag Carrying Case1 Foam Lined 5-Slot Carrying Case