L-XL blue Anti-Fogging Anti-Leak Full Face Snorkel Mask For Adults, L-XL AZ21897 [New Safety Breathing Mechanism Snorkel Mask]: This dry top full-face snorkel mask has the outstanding performance in breathing and air intake. Two completely separate air channels that you¡¯ll be inhaling through the top tube and exhaling through the valve at the side-bottom, which can effectively prevent the re-inhalation of exhaled CO2, thus ensuring that you inhale fresh air every time. When you snorkel, you won't feel dizzy any more, hence maximizing safety.[Anti-Fog for Panoramic HD View ]: Separate inhaling and exhaling channels stop the exhaled gas from your breath or water temperature causing fogging. Expect that, our snorkel mask adopts a transparent flat lens made by high definition PU resin, added the anti-fog effect flat crystal lens, double guarantee no fogging. Allowing you to enjoy the more crystal-clear views than other masks, with less distortion and HD 180-degree panoramic views.[Anti-leaking for Easy Breathing]: The snorkel mask features the anti-leak silicone seal system with two floating balls in the snorkel tube that prevent the salty water from entering in the mask. And the deeper silicone lining does not put too much pressure on your nose bridge to ensure that you are comfortable to wear.[Foldable Full Face Snorkel Mask And Support Camera]: The additional removable motion camera brackets allow you to easily capture your adventures and share them with your friends and family. It is extremely suitable for beginners, adults, and children. Even for inexperienced swimmers.