First off, great size. i love the size A mask that actually gives you space. The bad idea is that the material makes the mask very hot. During exercise, the neoprene will make your face hotter than the fabric. Second, the filters are rubbish. When I first put the mask on the filters started to loosen and the fibers were irritating my noise and mouth. I think the sweat caused by the neoprene quickly degrades the filter. Finally, the air vents are a joke. The first time I put them on for a run, I lost a valve. They would just fall apart. I would strongly recommend buying something else.
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