[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.