Cressi Duke Full Face Mask Cressis new Duke full face mask is designed with safety in mind. With a 30% larger viewing area, snorkelers can see all the underwater world has to offer without feeling claustrophobic. The dry snorkel keeps water out, while a specialized deflector maximizes air circulation and eliminates fogging. The valves design gives the user effortless and natural breathing, with a wide breathing area around the nose and mouth. Water draining valves safely remove any water that may enter the mask. This mask is designed for surface use only and should not be used at depth. The face skirt is made of soft hypoallergenic silicone that ensures comfort and a perfect seal. The two x-cross straps are easy to adjust for a perfect fit. The frame and lens are made of polycarbonate.Duke is the snorkeling full face mask that allows you to explore the underwater world from the surface. Duke offers a natural breathing experience due to the absence of a