A face shield
Is wearing a mask is effective in preventing COVID-19?
An experiment using high-speed video found that hundreds of droplets from 20 to 500 micrometers were airborne when speaking a phrase, but that nearly all droplets were blocked when the mouth was covered by a damp washcloth. Another study of people who had influenza or the common cold found that wearing a surgical mask significantly reduced the amount of these respiratory viruses emitted in droplets and aerosols. Washable face masks do this job for us. But wearing a face shield increases security from droplets.