The Bestway® Flowtech™ Full-Face Snorkel Mask has the most efficient airflow system of its kind! It’s perfect for all your favorite water adventures, including snorkeling, swimming laps, and exploring the open water. One-Way Airflow Technology: This innovative, next-generation mask and snorkel design allows you to breathe naturally through your nose and mouth while in the water. Breathe in the fresh air through one snorkel and breathe out the CO2 through the other with the one-way airflow technology. Full Dry Top Technology: The advanced dry top snorkel technology prevents water from getting into the mask when it is submerged.