Review on Lightahead Snorkeling Snorkel Advanced Breathing by Mark Gilbert

Well, the design is very wrong. The usual approach is to blow air into the mouthpiece through the front to remove any moisture. This is how 3M respirators are designed, this is how most full-face snorkel masks work. With this mask, the air is directed to the mouse and the face is not ventilated at all. So, after 10-20 minutes, the glass will fog up and become covered with a noticeable layer of water from the face. Another disadvantage is the quality of the valves, which makes the mask difficult to breathe. One of the inspiratory valves opens easily, while the other requires considerable force to open. So actually only one tube works, and she has the tube pretty close to the tip of her pinky finger. Nothing good. I will return them.