1176 gsm of spunbond NWPP in a washable mask

 Start with the 16 of this blog entry, and create an insert of 12 layers:

















Verdict: still breathable, but much less so than the 16 layer one on its own

The insert's pink template was made freehand. 
As a consequence it is a little short in the throat area,
which you can see in the last photo.

For reference, the mask I just made is more breathable than 
an FFP3 mask I've had for a couple of years:

















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