I've gotten many of these PM2.5 mask filters and they work great to give me that extra protection when I have to go out. I prefer the fabric masks over the cheap blue medical masks. These filters are thick and to use them, you simply fold them in half, slide them into the mask, then unfold it inside the mask pocket. You can use them once or twice, but then they need to be thrown out; these filters are not washable. They are highly effective!
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