Since they are many types of fabric masks available, does WHO have any guidance on which masks to use?

WHO is actively studying and encouraging research on the science of masks. New research findings identified the following preferable types of fabrics, number of layers and the composition of a non-medical, fabric mask:

• an inner layer of absorbent material such as cotton
• a middle layer of non-woven material such as polypropylene 
• an outer layer of non-absorbent material, such as polyester or polyester blend

More information on the types of materials and their effectiveness can be found in the updated mask guidance document - 

Make sure to construct or purchase a mask that lets you breathe while talking and walking briskly.

Remember, the use of a fabric mask alone is not sufficient to provide an adequate level of protection. Maintain a minimum physical distance of at least 1 metre from others and frequently clean your hands.

WHO recommends that people always consult local authorities on recommended practices in their area.