Our studies show that, if constructed properly with high-quality materials, a homemade cloth mask can function as well as or better than a surgical mask. Based on our studies, the WHO now recommends a cloth mask of at least three layers of different materials. The outermost layer should be made of a fabric that is at least somewhat water resistant. That can be a fabric that is a combination of cotton and polyester, nylon or rayon. The middle layer should either be a polypropylene — a spunbond material used in some reusable grocery bags, mattress covers and craft projects — or three-ply disposable facial tissues like Kleenex. Finally, the innermost layer should be a wicking material to draw moisture away from the face. One hundred percent soft cotton works well here. Fit is also important. It shouldn’t fit too tightly, but it should sit against the skin all the way around from the middle of your nose to under your chin and almost to your ears, and it shouldn’t gape or bulge away when you move your head or speak. Finally, treat your mask like your toothbrush. Don’t share it with anyone, and keep it in a plastic Ziploc bag when not in use. When you remove it, do so in a way that doesn’t spread germs from the front of the mask to your face, and wash your hands after touching the mask.
Another good article about which type of fabrics are best for facemarks can be found HERE.
