Riffe Frameless Mask - Low volume mask fits a variety of faces and has a single lens for great visibility. Excellent mask if you have trouble with mask pressure on your brow. Highest quality construction and materials you can see, feel and appreciate dive after dive. Features a superior fitting black silicone mask skirt and nylon frame for excellent strength. Unique, low profile mask adjustment buckles. Riffe masks are also made with a patented heat treating process to minimize fogging.