The CDC recently updated their guidelines regarding masks, recommending the use of a mask with a nose wire (a metal strip along the top of the mask) to keep air from leaking out of the top of the mask. This has the added benefit of keeping eyeglasses and sunglasses from fogging up and obscuring vision.
Once the mask is on, check to make sure it fits snugly over your nose, mouth, and chin. Air should not flow from any side of the mask. To aid in this fit, consider the use of a mask fitter (also known as a mask brace) to prevent air from leaking around the sides of the mask. These devices are meant to go on the outside of the mask and fit snugly around your mask.
For extra protection, you may consider wearing two masks, but be aware that two disposable masks will not improve the fit and are not designed to fit together tightly. Instead, use a disposable mask under a cloth mask. The cloth mask will help push the edges of the inner (disposable) mask against your face, improving the seal.
An exception to the two-mask idea above involves KN95 masks. These masks are not designed to be worn with other masks and should not be combined with any other mask.
Remember, the goal of a mask is to keep your respiratory droplets in and the respiratory droplets of others out. Clean cloth masks as recommended by the manufacturer and throw away disposable masks as required.
