@MyMirmar Hi , I want to ask you something . I regularly go to the pool and very well know how to swim underwater in swimming goggles, but I have never used a mask . Why , before you dive in , you need to hold your breath , as in glasses for swimming ? The nose is protected , isn`t it ? Why the mask you can't breathe under water ? After all, under glass, a large mask space with some air ? What happens if you breathe that air in the mask with your nose ? These air can't you breathe ? I just don't quite understand , thanks in advance for the answer to your mermaids same , I`ll be w8 :)