Scientific Study finds combination of silk and cotton with good fitting make the best protection:
https://www.newsweek.com/best-homemade-face-masks-covid-19-cotton-silk-study-1500059
Scientific Study finds combination of silk and cotton with good fitting make the best protection:
https://www.newsweek.com/best-homemade-face-masks-covid-19-cotton-silk-study-1500059