The Shift MAG™ gives cyclists and runners every performance advantage possible when it comes to speed. These sunglasses feature MAG™ interchangeable lens technology, which enables quick, fingerprint-free lens changes. They come with one clear lens as well as a color-enhancing ChromaPop™ lens. The superlight 5-base frame includes our two-position nose piece and no-slip temples, giving you a secure fit when you're going your fastest. Smith Shift Mag Features: Vision ChromaPop™ lenses enhance contrast and natural color to make the details pop Fit / Integration Medium fit, large coverage 5-base lens curvature for slight wrap fit Megol temples provide non-slip grip so glasses stay put Two-click position adjustable fit Megol nose pads Frame Smith MAG lets you change lenses quickly High impact resistant TR90 nylon frame