"Cloth masks are little more than facial decorations. There's no place for them in light of Omicron," CNN medical analyst Dr. Leana Wen, an emergency physician and visiting professor of health policy and management at the George Washington University Milken Institute School of Public Health, recently said on "CNN Newsroom."
N95 masks are considered the standard here in the United States, while the KN95 is China’s equivalent. Both masks are made from multiple layers of synthetic material (typically a polypropylene plastic polymer) and are designed to be worn over the mouth and nose. And both masks must be able to filter out and capture 95 percent (the figure seen in the mask names) of 0.3-micron particles in the air.
Quote CNN https://www.cnn.com/2022/01/15/health/mask-guide-faq-n95-kn95-wellness/index.html