16 C.F.R. § 303.6
(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:
80 percent Rabbit hair. 20 percent Nylon. or 80 percent Silk. 20 percent Mink fiber.
(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:
60 percent Cotton. 40 percent Fur fiber. or 50 percent Nylon. 30 percent Mink hair. 20 percent Fur fiber.
[24 FR 4480, June 2, 1959, as amended at 45 FR 44263, July 1, 1980]