Cressi Duke Full Face Mask180 field of vision: cressi duke boasts a visual field that is 30% larger than normal full face masks Stop fogging the new baffle that cressi has created optimizes air circulation, completely eliminating the fogging effect Safety valves: special safety valves allow you to easily purge water Natural breathing: ample front area lets you breathe naturally through your nose and mouth with 0% effort Dry snorkel: the snorkel features a special dry system