TUSA M110SQB Visio Pro 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 lense offers the diver enhanced colour, clarity, contrast and eye protection without sacrificing light transmission or vision on the surface or underwater. The Visio Pro's lens is protected by a special edition two-piece chrome frame and black surgical grade silicone skirt. 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.