16 CFR § 303.6 - Generic names of fibers to be used.
(a) Except where another name is permitted under the Act and regulations, the respective generic names of all fibers present in the amount of 5 per centum or more of the total fiber weight of the textile fiber product shall be used when naming fibers in the required information; as for example: “cotton,” “rayon,” “silk,” “linen,” “nylon,” etc.
(b) Where a textile fiber product contains the hair or fiber of a fur-bearing animal present in the amount 5 per centum or more of the total fiber weight of the product, the name of the animal producing such fiber may be used in setting forth the required information, provided the name of such animal is used in conjunction with the words “fiber,” “hair,” or “blend;” as for example:
(c) The term fur fiber may be used to describe the hair or fur fiber or mixtures thereof of any animal or animals other than the sheep, lamb, Angora goat, Cashmere goat, camel, alpaca, llama or vicuna where such hair or fur fiber or mixture is present in the amount of 5 per centum or more of the total fiber weight of the textile fiber product and no direct or indirect representations are made as to the animal or animals from which the fiber so designated was obtained; as for example:
(d) Where textile fiber products subject to the Act contain (1) wool or (2) recycled wool in amounts of five per centum or more of the total fiber weight, such fibers shall be designated and disclosed as wool or recycled wool as the case may be.