The fineness of each yarn is referred to as yarn size.
The higher the yarn size the finer the thread. For cotton fabric, fineness is measured in four common sizes, 20s , 40s, 60s and 80s, each being used for different purposes. The 20s might be used in cheaper quality t-shirts while 80s is an extremely fine thread and would be more likely found in a good quality dress shirt.
Single ply yarn produced from long staple cotton fall into the finer thread categories of 60s and 80s. These form the best weights for sheets and bedding.
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