The Show X3 features the Flyfree Interchange Lens System, allowing for quick lens transitions between varying light conditions. The design facilitates a secure flip, mount, and lock mechanism for versatile performance. max optics with anti-reflective coating interchangeable lens system 4-base flat lens slim profile flexible silicone-wrapped nose pad and temples extra set of interchangeable lenses injected frame material derived from castor bean oil optical clip-in for prescription lenses