Goat hair. The chinese long-haired goat are one of the softest material. The goat are not harmed for their hair, it is a by-product of the meat industry.
The hair of the Chinese long-haired goat is by far the softest material in our brushes. Its very fine and dense hair is used in dusting brushes, in cosmetic brushes, amd also in hairbrushes for babies.
Before manufacture, all natural hair and bristles are cleaned, scoured, and combed in a costly multi-stage process. We call this treatment "finishing".