fit snugly but comfortably against the side of the face
be secured with ties or ear loops
include multiple layers of fabric
allow for breathing without restriction
be able to be laundered and machine dried without damage or change to shape
CDC on Homemade Cloth Face Coverings
CDC recommends wearing cloth face coverings in public settings where other social distancing measures are difficult to maintain (e.g., grocery stores and pharmacies), especially in areas of significant community-based transmission.
CDC also advises the use of simple cloth face coverings to slow the spread of the virus and help people who may have the virus and do not know it from transmitting it to others. Cloth face coverings fashioned from household items or made at home from common materials at low cost can be used as an additional, voluntary public health measure.
Should cloth face coverings be washed or otherwise cleaned regularly? How regularly?
Yes. They should be routinely washed depending on the frequency of use.
How does one safely sterilize/clean a cloth face covering?
A washing machine should suffice in properly washing a face covering.
How does one safely remove a used cloth face covering?
Individuals should be careful not to touch their eyes, nose, and mouth when removing their face covering and wash hands immediately after removing.
So what masks are the most breathable? According to SF Gate, there are a few. Here is an example of one. Look for masks made of breathable materials for exercise and sports—athletic wear companies have shifted some of their resources toward producing masks made of moisture-wicking materials typically reserved for undergarments and workout clothes, for example.