Used Ocean Reef Uno Full Face Snorkeling MaskDescription Breathe through your nose while snorkeling. Good bye jaw discomfort (no uncomfortable mouthpiece to bite onto). Good bye difficult breathing and goodbye water in your snorkel thanks to our dry snorkel. For good. Huge field of vision and no more fogging thanks to our patented and independently tested air circulation technology. Our FFSM line has a uniquely designed orinasal for optimal sealing around your nose. All our tests are conducted