One recommends the Jesse Mask from The Fabric Patch. The website has six You Tube videos about various aspects of mask making: http://www.fabricpatch.net/face-masks-for-covid-19-relief.htm
She used Vilene interfacing as the filter layer in her masks (because that was what she had). The videos cover a number of options.
Another has investigated mask making and use deeply, and makes these recommendations:
- the podcast Just Wanna Quilt (probably best summarised on Homemade Mask Summit Parts 1 and 2, 19 and 27 June- nearly 10 hours in total)
- batik fabrics are considered ideal by the experts, due to the very tightweave and heavy dye
- I also use interfacing for the middle layer; it is suggested not to use fusible interfacing due to inhalation of the adhesive, although I think that is probably only an issue if someone was going to be wearing it for many hours/days/weeks/months at a time.
- flannelette has been recommended as the ideal inner layer, which works well for a winter mask, but is probably too hot for summer
- ties are better than elastic for fit and repeated washing, but since ours will not be used and washed in an industrial setting, elastic (1/4"wide) is probably OK and so much quicker! (Using my husband and daughter as prototypes, I cut the elastic 5-1/4" for women and 6-1/4" for men, using a 1/4" seam on a 3-pleat version, and it seems to fit people well.)
Spotlight has advertised packages of jersey 'yarn' suitable for ties that are soft and slightly stretchy.