Federal government guidelines for personal masks for COVID19 from Canada.ca suggest 2 layers of tightly woven material (such as cotton or linen) and note that the material should be breathable. Keep in mind that, for a mask to be effective, it has to be worn. So, if it’s too warm (like synthetic fabrics) it’s more likely to be taken off.
- For this project, we prefer to use 100% cotton fabric that can’t be seen through.
- Silk, chiffon and linen also filter well (but are harder to work with).
- Flannel works, but that starts to get into the too-warm-to-wear category.
- Cotton-poly blends (like good quality sheets) also work well but may become warmer than 100% cotton. For this reason, we do not recommend their use.