Super 100, 100's or 100s?

[Guest]

As a foreigner a need an explanation. I know Super 100/100's/100s refer(s) to the finesness of the yarns (or hansks) but why the "s"?

[Guest]

The s just makes it plural - the cloth is made from super 100 yarns.

[Guest]

(So, in case you wonder, the plural is "Super 100s": no apostrophe.)