Most experts say a cloth mask over a surgical mask is the way to go. A cloth mask can also help when worn over a KF94 mask, which are certified in South Korea to filter at least 94% of very small particles, says Dr. Marr. KF94s can be somewhat loose on the sides, so a cloth mask can help pull it tighter to your face.

A second mask is generally not necessary when wearing an N95, which are certified to filter out at least 95% of very small particles, or a KN95, the Chinese equivalent of an N95. But it could help protect the N95’s material and extend its use.

It’s important to maintain breathability when double masking, says Dr. Volckens. “If a mask isn’t breathable, one of two things happens,” he says. “If there’s too much resistance the mask will leak, or if it’s too uncomfortable you will take it off.”

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