These masks and their international counterparts known as KN95s and KF94s are often made of multiple layers of polypropylene, a synthetic fiber. They are designed to achieve a very snug facial fit, with straps that go around the back of the head and edges that form a tight seal around the nose and mouth.
"The best masks are some version of N95," said Eric Toner, senior scientist of environmental health and engineering at Bloomberg School of Public Health, Johns Hopkins University."N95s, KN95s and KF94s are functionally equivalent."WHAT ABOUT FAKE MASKS? The CDC said a NIOSH-approved N95 provides the most protection. Well-fitting surgical masks and KN95 masks offer the next best protection, followed by cloth masks with multiple layers. Loosely woven cloth masks are the least effective but can provide an additional layer of protection when worn over a surgical mask.
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