Pros: Good value, Good quality, Comfortable, Lightweight, relieves build up of sweat
I actually use this for hiking. These valves really assist me to breathe more easily when wearing a pollution mask, because, instead of exhaled, warm moist air building up behind the mask and creating sweat, the air is released. Perspiration under the mask is very uncomfortable. Previously I was using a product without valves and it was awful. So I am exceptionally please with my purchase. Thanks for your servies!
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