The Centers for Disease Control and Prevention (CDC) recommend wearing masks in public settings. Masks should have two or more washable layers of breathable fabric, and should completely cover your nose and mouth. 
Masks are effective at preventing the spread of COVID-19. Researchers suggest that face masks reduce the spread of viral respiratory infection, and that N95 respirators and surgical masks both provide substantial protection (compared with no mask). Surgical masks provide greater protection than cloth masks. 
A meta-analyses investigating the use of face masks and eye protection to prevent transmission of viruses found that face mask use could result in a large reduction in risk of infection (n=2647; aOR 0·15, 95% CI 0·07 to 0·34, RD −14·3%, −15·9 to −10·7; low certainty), with stronger associations with N95 or similar respirators compared with disposable surgical masks or similar (eg, reusable 12–16-layer cotton masks; p-interaction=0·090; posterior probability >95%, low certainty). Researchers used data pooled from observational studies, with a total of 172 studies from 16 countries across six continents used for the meta-analyses.