Gather the supplies you need to construct the mask:
Two 6" x 9" (15 x 23 cm) sheets of non-woven interface material. These give the mask structure and provide additional filtering of particles. Standard melt-blown filter material comes on rolls that are 6.89'' (17.5 cm) wide and sold in lengths of 5-100 meters.
Two 6" x 9" (15 x 23 cm) sheets of high thread-count cotton fabric. Look for muslin (plain woven cotton fabric) with a thread-count of 200 or higher. Old pillowcases are great.
If possible, I recommend using two different fabrics, one lighter (for the inside) and one darker (for the outside).
Two 12" (30 cm) long pipe cleaners. Four 6" (15 cm) long pipe cleaners will work too.
I suspect that aluminum armature wire would also work well here. Pipe cleaners provide padding and are easy to find.
Two 12" (30 cm) long pieces of 1/4" (or 6 mm) wide woven elastic band. Slightly thicker elastic band should also be fine. This material is often found on 100-200 yard spools.
I think non-elastic straps are annoying for this kind of mask, but you can use them if you don't have any elastic. You need to make them long enough to be able to be tied, so I'd recommend starting with at least 20" (0.5 m) for each individual strap.
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