This is the Tusa Visio Pro Single Lens Scuba Diving Mask with Anti-Reflective and UV Coating Features: Low profile, single window teardrop design TUSA CrystalView Optical Glass Lens (pat p.) Anti-Reflective and UV Lens Treatments Special Edition Chrome Frame Enhanced field-of-view over 2-window masks Skirt mounted Quick-Adjust Buckle System Round-edge skirt for maximum fit and comfort 3-D strap for ideal anatomical fit The Visio Pro mask combines TUSA&';s superior design and build quality with new innovative materials and frame construction. It features TUSA&';s all new Crystalview Optical Glass treated with a proprietary anti-reflective (A/R) and ultraviolet (U/V) coating up to twenty layers thick. This unique Crystalview AR/UV lens offers the diver enhanced color, clarity, contrast and eye protection without sacrificing light transmission or vision on the surface or underwater. The lens is protected by a special edition two-piece chrome frame and black surgical grade silicone skirt.