Cloth Face Coverings [Masks] provide a physical barrier that reduces the transfer of airborne droplets which cause respiratory infections. Recommend 3-4 fabric layers. Each layer has a unique function in providing a barrier. Exterior fabric - A tightly woven above 300 thread count or non-woven fabric. Interior fabric - absorbent interior layer such as 100 % cotton t-shirt knit. Interior filter – non-woven textile such as non-woven interfacing, polypropylene or non-washable coffee filter. A face covering/mask does not guarantee protection against the transmission of any disease.
https://extension.okstate.edu/coronavirus/media/home/diy-masks-english-covid-19.pdf
This series was created by Dr. Lynn Boorady and Dr. Sumit Mandal with Design, Housing, andMerchandising, and Karla Knoepfli with Oklahoma 4H and is as part of the OSU Extension effort in combating COVID-19.
You can find more information at the following websites:
https://www.cdc.gov/
https://extension.okstate.edu/coronavirus.html