The strong furry leather of a bear. Compared to most leather, it is quite a bit tougher and a bit better at all kinds of temperature regulation.
The following animals provide Bearskin.
Bearskin is the 6th most protective textile against sharp and blunt, and tied 3rd against heat. While it is not the very best insulator, it is decent and is one of the best balanced textiles between protection and insulation. It is a very good candidate for dusters and protective clothing in the early game. However it should be replaced by better materials such as devilstrand in the mid-game, with dusters receiving priority. As it provides enough sharp protection for even pants and button-down shirts to have a chance to stop attacks, it can be valuable to transition to using bearskin for those items to save limited stocks of better materials for dusters where they will have more impact while still providing some chance to deflect a blow after AP.
For use in furniture, it has a middle-of-the-road beauty factor, but its eventual redundancy as clothing and the demand for more beatiful textiles like Thrumbofur in other roles makes it a decent choice for improving furniture beauty once the colony has transitioned to more protective textiles.