https://smartairfilters.com/en/blog/best-materials-make-diy-face-mask-virus/ https://smartairfilters.com/en/blog/best-materials-make-diy-... I was concerned wi

https://smartairfilters.com/en/blog/best-materials-make-diy-face-mask-virus/ https://smartairfilters.com/en/blog/best-materials-make-diy-... I was concerned with the use of cotton but there's room for flexibility. Still. Don't make masks so you can hang around outside for hours like you used to.