The Bestway Hydro-Pro Seaclear Flowtech Snorkeling Mask Allows You To Breathe Freely And Naturally Underwater;The Soft Silicone Rim Of This Full Face Snorkel Mask Provides An Extra Comfortable Fit And Allows You To Equalize Pressure,The Dual Air Flow Technology Has Two Snorkel Openings, Designed To Allow You To Breathe Through Your Nose And Mouth,The Full Face Mask Dry Top Technology Prevents Water Getting Into The Mask When Submerged.