September 5, 2020 Coronavirus disease (COVID-19) advice for the public: When and how to use masks - WHO WHO’s recommended fabric mask materials and composition WHO's recommended fabric mask How to put on, care for and select a fabric mask Tips on how to sew a three-layer fabric mask How to wear a medical mask Medical and fabric masks: who wears what when? Source: https://www.who.int/emergencies/diseases/novel-coronavirus-2019/advice-for-public/when-and-how-to-use-masks