Waste of money! I will start with the only good thing it has, which is that you can breathe through your nose. However, it fails even in that aspect because it is very difficult to breathe since the air is simply not enough... It may have two tubes for this purpose, which have a satisfactory diameter throughout their length except... the point where they connect to the mask, where the connection leaves only a small hole for the air to pass through, essentially determining its flow. In the half hour that I tried it, I constantly felt that I couldn't breathe enough. The second negative (for me) is that you have to wear the mask very tightly to prevent water from entering, which, combined with the fact that the XL size I bought (which is the largest the mask offers) did not properly cover my face in any case (I am 1.85m), resulted in the chin being left out or if I pulled it downwards to cover the chin, it put unbearable pressure on my nose. Overall, very uncomfortable. In the half hour, it did not fog up, but I did not notice any significant advantage visually compared to a regular mask. The breathing tubes, although they appear long, easily get blocked even in the presence of small waves. It would help if they were at least 5-10cm longer. Considering the above, plus the fact that it takes up double or triple the space in luggage, I would say "stay away"!