Some masks work better than others to help stop the spread of COVID-19 outside of healthcare settings. Medical masks and N-95 respirators should not be used because they should be conserved for healthcare personnel.
Non-medical disposable masks
Masks that fit properly (snugly around the nose and chin with no large gaps around the sides of the face)
Masks made with breathable fabric (such as cotton)
Masks made with tightly woven fabric (i.e., fabrics that do not let light pass through when held up to a light source)
Masks with two or three layers
Masks with inner filter pockets Not Recommended
Masks that do not fit properly (large gaps, too loose or too tight)
Masks made from materials that are hard to breathe through (such as plastic or leather)
Masks made from loosely woven fabric or that are knitted, i.e., fabrics that let light pass through
Masks with one layer
Masks with exhalation valves or vents
Wearing a scarf/ski mask as a mask
Stay Safe
Cited from CDC:https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/cloth-face-cover-guidance.html