For use at the gym - beware not for flying
If your mask is too tight that prevents you to breath, this product is for you. It will create some kind of "gap" near your nose for free air exchange, especially at the gym where you are doing cardio and breathing more heavily.<br /><br />However, I do not recommend it for use in the airplane where you do NOT want UNFILTERED air entering your nose.
Rating: 4 stars