This Face Cover Sock Hack Is So Simple – But Is It Effective?
Face coverings are now mandatory on public transport in England. Here's how to make one with a sock.
Sharing this again in case helpful. How to make a face covering from a sock.
says to layer up material if you do this: “The main thing I’d want to see [in a face cover] is a double layer of cloth, and preferably two different fabrics."