Wearing a cloth mask over a medical procedure mask can significantly decrease the spread of COVID-19, according to a new study the Centers for Disease Control and Prevention released Wednesday.

The agency updated its guidance to note that double masking, or wearing a tightly-fitted surgical mask are two of the best ways to boost protection against exposure. 

CDC researchers experimenting in a lab found that the better the fit of the mask, the better the protection it provides.

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"The effectiveness of cloth and medical procedure masks can be improved by ensuring that they are well fitted to the contours of the face to prevent leakage of air around the masks’ edges," the agency said.

Double masking or knotting the ear loops of a surgical mask and tucking in the sides close to the face can reduce exposure to infectious aerosols by 95 percent, CDC found.

The agency also said that if a medical procedure mask is worn alone, using a "mask fitter" or wearing a sleeve made of sheer nylon hosiery over either a cloth or medical procedure mask also significantly improved the wearer’s protection.

In general, any modifications to improve fit might result in equivalent improvements, regardless of the masks’ baseline effectiveness, CDC said. Read more at The Hill