THE QUAD C DELIVERS ON FORM AND FUNCTION by combining a soft and supple double-flanged silicone skirt with a leak-proof seal and a patented quad lens with "seamless" side window that provides an unobstructed panoramic field of view. A patented push-button buckle is offered for lightening-quick strap adjustments, that can be made easily with gloves, and tough ultra flexible attachments ensure a solid hold once the mask is in place.