This is my understanding. I think "fios" means what we would call 'fibers' in English in this context.

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Note added at 19 hrs (2016-09-16 21:50:57 GMT)
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I'm gaining more confidence. Lots of references to 'fiber labeling' and very few to 'thread labeling'. Examples:

Threading Your Way Through the Labeling Requirements Under the ...
https://www.ftc.gov/.../threading-your-way-th...
Federal Trade Commission
Jul 2, 2014 - **Most textile and wool products must have a label listing the fiber content**, the country of origin, and the identity of the manufacturer or another ...

[PDF]**Textile Fiber Labeling** - Nordstrom Supplier Compliance
www.nordstromsupplier.com/NPG/.../Textile Fiber Labeling.pd...
The U.S. Federal Trade Commission (FTC) regulates the Textile Fiber Products Identification and. Wool Products Labeling Acts. By law, the fiber content needs ...

[PDF]Textile and Apparel Labeling
pdf.usaid.gov/pdf_docs/Pnadx209.pdf
In the case of textiles and apparel, considered trade sensitive in most economies ..... to their **fiber labeling regulations**, which they publish to serve as a guide for.

Prospect of bamboo as a renewable textile fiber, historical overview ...
link.springer.com/.../s40691-015-0054-5Springer Science+Business Media
by L Nayak - ‎2016 - ‎Cited by 1 - ‎Related articles
Innovation in textile has brought alternative plant based fibers such as bamboo into the ... bambooMorphologyAnatomyPatents**Bamboo fiber labeling** Regulation ...

**Labeling of Textile Fiber** - Scribd
https://www.scribd.com/document/150090820/Labeling-of-Textil...
TEXTILE FIBER LABELING. AUGUST 2010. The U.S. Federal Trade Commission (FTC) regulates the Textile Fiber Products Identification and Wool Products ...