airtight and comfortable, unfortunately wet

Neutral
- The mask is almost odorless. A smell is unfortunately exist, but the smell is much lower than other masks.

Disadvantages
- Formation of exhaled breath condensate
- Exhalation valve is defective after about 100 hours Application

On the last point:

The exhalation valve is defective after about 100 hours of use. It opens only from a higher pressure, so that you only need to build up pressure when you exhale each time, which then breaks down all of a sudden, as the valve opens. This is of course umangenehm.

After it happened to me the first time I've bought a new mask (it's relatively cheap). In this mask, the valve had but after about 100 hours of use have the same problem. So I have looked at times more accurate and could resolve the issue.

In addition I have the piece of plastic outside opened before the valve by I Just Shoot 2 of 4 plastic connectors with pliers. After that I could open the plastic and use your fingers to the valve. The valve is a round, soft rubber disc that flips open by air pressure. Apparently it was a little bent or so. It is even softer than thin paper, but paper can bend so, so that it is permanently deformed. I have bent a little outwards. Then it worked immediately correct.

These repairs should I bring about resisting every 100 hours, but that's a small effort. You just have to know first.