You cannot make this up...The CDC now recommending double layer masks. At the end of the recommendation the CDC say, "make sure you can breath easily."
https://www.cdc.gov/coronavirus/2019-ncov/your-health/effective-masks.html
Improve How Your Mask Protects You | CDC
Learn more about how to make sure your mask works effectively.
https://www.cdc.gov/coronavirus/2019-ncov/your-health/effective-masks.html