Cressi Duke Full Face MaskCressi Duke is the evolution of the first full face mask ever produced, called the Medusa, made in 1946. Full face mask for snorkeling Designed with extremely high quality materials and technology. You can explore the world underwater, breathing naturally through the nose and mouth with 0% effort. Its visual field is 30% larger than normal full face masks. The new air baffle completely eliminates fogging. It features special safety valves for purging