The Aqua Lung Smart Full Face Snorkel Mask is a mask that will cover your face to keep the water away from your eyes nose & mouth so you can explore the oceans more comfortably. Unlike a traditional mask & snorkel set up you don't need to hold the snorkel in your mouth by biting down on a mouthpiece & you can breathe through both nose & mouth. The very top of the snorkel has a float inside that will block the top when submerged so even if you duck under the water or a wave splashes over it will help prevent any water from getting in. Even if a small amount of water does get into the mask it will collect down at the bottom by your chin & be pushed out of the mask when you breathe out. Another benefit of the Mask is that you don't have to defog or prepare the lens before you go out because every time you breathe fresh air will defog the mask. The humid air you breathe out is circulated around the outside of the mask & then out so you only ever breathe fresh air. The Smart also has one of the lowest work of breathing compared to similar masks like the Tribord & Oly Speed making it easier & more natural to breathe from. Work of Breathing (J/l) @25 bpm Aqua Lung Sport Smart 1.19 Triboard 1.94 Olyspeed 2.24 Note from the manufacturer: Due to its construction & the volume of the integrated snorkel, this product is for users with a large lung capacity only (>150cm body height) It must not be used by children or persons with small lung capacity (<150cm body height) in order to avoid any risk of increased CO2 levels in the body during use. ABOUT Aqua Lung Aqualung have been industry leaders producing a range of diving equipment from regulators & computers to drysuits, wetsuits & masks. Aqualung have been producing dive equipment since 1943, started by Jacques-Yves Cousteau & Émile Gagnan who introduced the world to scuba diving & the Aqua-Lung.