Scott N. Schiffres

Masks work only if they fit well, and wearing two can ensure a tight fit. Eduardo Maquilón/Getty Images/Stringer via Getty Images News

CDC says masks must fit tightly – and two are better than one

How well your mask works depends on how well it fits. Wearing two snug masks made of different materials offers 95% protection from exposure to aerosols that could contain the coronavirus.

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