The Best And Worst Face Masks For COVID-19, Ranked by ...
Jul 16, 2020·"Hybrid" masks are the safest homemade option. In a recent paper that hasn't yet been peer-reviewed, researchers in the UK determined that "hybrid" masks – combining two layers of 600-thread-count cotton with another material like silk, chiffon, or flannel – filtered more than 80 percent of small particles (less than 300 nanometres) and more than 90 percent of larger particles (bigger than ...