The Vellus Aureum wool fibers must measure a mere 13.9 microns (closer to the fineness of a cobweb).

WSJ: Ermenegildo Zegna Spins Fashion Gold | WSJ. Magazine May 2013

In both cases men (who are hairier than women, as measured by the density of follicles and the length of the vellus hair) were better off than women when the bugs were released on unshaven patches of skin, though there was no significant difference between the sexes when they were shaved.

ECONOMIST: Body hair

Ms Dean and Dr Siva-Jothy were testing the idea that fine body hairs (known, technically, as vellus and terminal hairs) are there to alert their owner to creepy crawlies such as bed bugs, which might be intent on biting them, and that the hair may also get in the way of such arthropods' activities, giving the owner more time to react before he is bitten.

ECONOMIST: Body hair