The U.S. Divers AirGo 180° Panoramic Full Face Snorkel Mask is a unique dual chamber AirGo™ System that separates inhaled fresh air from exhaled carbon dioxide. This ensures that you don’t rebreathe your own exhaled CO2, and are only breathing the fresh air around you. The AirGo™ features a oneway purge valve, quick release, tri pad connector, and a smart lock designed for travel. Take this snorkel mask is for local or worldwide water fun adventures.