"...After running about 300 tests, the team found that one of the best readily available materials to use in a homemade face covering is four-ply microfiber cloth, which is popular for cleaning and polishing surfaces, according to the release.

"It filters out over 75% of particles," according to the release. "In comparison, the N95 mask used by healthcare workers in hospitals can filter 95 percent of particles or greater."

Testers also found that "even a polyester bandana can be reasonably effective if it is used in layers, according to the release, which adds that it will filter out "40 percent of suspended particles."