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Download the instructions here (PDF).


Be creative! Use what you have at home! The materials specified are purposefully vague, you won't find any Amazon links because if we all tried to use the same thing, we'd all just run out faster.


Use anything. Old bedsheets, pillowcases, dish towels, napkins. Literal rags. No need to go out any buy anything new, that would miss the point. Flannel is super cozy. High thread count stuff actually has pretty decent filtration ability even without a "real" filter layer.


More info forthcoming. For now check out https://smartairfilters.com/en/blog/best-materials-make-diy-face-mask-virus/ for a good overview of existing data. We've been using air conditioning filters (1 or 2 layers of MERV-13 and MERV-14 filters, no fiberglass!). Anything is better than nothing, so even if you leave this out, the mask will help. (But don't let it give you a false sense of security).


14 gauge copper wire works great, stiff but flexible enough to conform to the nose. (12 gauge will do in a pinch, but it's really stiff). Doubling up 18 gauge also works. If you don't have wire, be creative! You can also try:

Tip: If using thin wire, fold back the ends so they don't end up poking through the fabric.

Random Info That Might Be Handy

Here's an unedited collection of random bits of info, updated very intermittently.

Out of curiosity, we tested non-medical materials for filtration. A scarf is NOT helpful for filtering aerosols, which may carry coronavirus. Instead, what about furnace filter/pillowcase? Thanks, @linseymarr for the filtration test doc! @MissouriSandT @JGB_Burken @aaqrl_wustl https://t.co/nm4j1WA3ct pic.twitter.com/5RkzYdYdnt

— Yang Wang (@carlwangyang) April 3, 2020

And if you don't have a sewing machine or even a needle and thread...

Oooh, handy for those of us who can't sew or don't have a machine! Mask-making with a handkerchief & hair ties: https://t.co/xnp30VzmpQ

— N. K. Jemisin (@nkjemisin) March 31, 2020