The three-layer fabric mask: research has shown that this combination of materials and layers provides a higher level of breathability and filter efficiency than one layer cotton masks. See what to look for whether you are buying a fabric mask or making one.
Find out more about how to wear a mask from WHO: https://www.who.int/emergencies/diseases/novel-coronavirus-2019/advice-for-public/when-and-how-to-use-masks
Questions on masks? Go here: https://www.who.int/emergencies/diseases/novel-coronavirus-2019/question-and-answers-hub/q-a-detail/q-a-on-covid-19-and-masks