ZEP’s industrial blue towels were incorporated in this mask. You can also use use Toolbox’s blue towels. I experimented making these multi-layer cloth masks with the idea that they provide better protection than just a two-layer cotton cloth mask. Note: These masks don’t protect you against COVID-19, but are useful for keeping your hands from touch your face and to reduce spray of droplets from your coughs, sneezes, and talking. In that regard, I think a three-layer mask with just one shop blue towel between the cotton fabric, instead of two that I experimented with, is probably good enough. Of course you can make the mask entirely from the shop blue towel cloth, but that would look kind of boring without the colorful cotton fabrics.
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