Tanned, dried, scraped rhinocerous skin. It is exceptionally durable in combat, but provides little protection from weather.
The following animals provide rhinoceros leather.
Rhinoceros leather is 4th most protective textile in the game. Outside of extreme biomes, where its mediocre insulation may be inadequate, these stats make it 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 rhinoceros leather 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.