[ptspin]

This article claims that higher threadcounts (as high as 680) improves the filtering of 2-layer 100% cotton masks. However, it seems that threadcounts this high are primarily a marketing gimmick by sheet makers that don't really make practical sense. Furthermore, because it's marketing gimmick, you can't really go out and buy so-called "680 threadcount cotton fabric" you can get sheets labeled that way but not a bolt of fabric from a craft store. I wan't to know what fabric they actually used to make this theoretical mask, without that this seems pretty specious.

[gamblor956]

Why do you think high threadcounts are a marketing gimmick in this context? Threadcount is just a measure of the number of threads in a square inch of fabric. The higher the threadcount, the denser (and heavier) the fabric is. Higher threadcounts also mean that a fabric is less breathable as less air can pass through.

Generally, craft stores sell only a handful of different threadcounts of a given type of fabric, usually very low threadcount, but in dozens of different patterns, because customers are buying based on patterns, not fabric density. Also, higher threadcount fabrics are more expensive and thus less in demand, so generally need to be purchased special order. Alternatively, you can buy directly from a clothing/fabric wholesaler (though the wholesaler may ask for a reseller's license first).

[mikestew]

Threadcount is just a measure of the number of threads in a square inch of fabric.

No, it is not; that's what parent was getting at.

"The amount of thread that can fit into a square inch of fabric is limited, suggesting that bedding beyond 400 count is likely a marketing strategy." https://en.wikipedia.org/wiki/Units_of_textile_measurement#T...

[gamblor956]

Yes, it is. Yarn can be twisted in multiple sizes. High thread count fabrics use yarns that are smaller, so that they have fewer individual stands. That is why they feel smoother.

[bradknowles]

And they can only go so small. After a certain point, you cannot effectively make a thread any smaller.