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The medical ones seem to leave even more of a gap around the edges than regular ones. I thought I read or heard from a doctor friend they're mainly to protect the wearer or patient from really large droplets or even fluids like blood splatter, but they don't do much with aerosols.Hm, that's a good point, I hadn't thought of that.
When this whole thing started, I interviewed JefferyD, who was working to make masks for hospitals. He told me about spunbond, which is the nonwoven material that's used for filters. He also talked about how he thinks it's important to have a moldable nose bridge for a tighter seal, and have fewer seams on the mask, as seams create small holes. (This was when people were still making masks from spunbond).
So since then, I've just been looking for masks that have a nose bridge, spunbond filter, and fewer seams. But hadn't thought about how a pouch-contained filter might be less effective
I have a few packages of basic medical masks, which is what I've been mostly wearing. And I have a blue linen Proper Cloth mask with a pouch-contained filter, which I wear on occasion. Maybe I should stick with the medical masks.
Ralph Lauren is coming out with this mask this season. It has three layers, like other filter-based masks, but also this system that tells you when you need to change filters. Apparently, these little things change color or something.
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Btw, this was a great line:
...For a guy who wears suits with a 6" leg opening, you post surprisingly like a guy who wears a 9" leg opening.