This demonstration video discusses and shows the features of the TUSA Visio Pro Crystal View Scuba Dive Mask. The TUSA Visio Pro Crystal View Scuba Dive Mask is for Medium-Large Faces (110 lbs+). This Low Profile Mask uses the TUSA CrystalView Optical Glass Lens with Anti-Reflective and UV Lens Treatments. It has a single lens for wide angle, unobstructed vision. It is made from crystal silicone - The highest grade silicone available for a soft comfortable seal.