Thick leather covered in a long, rugged mat of fur. Harvested from a large, hardy animal. This thick skin insulates and protects very well.
The following animals provide heavy fur.
Heavy fur is the 5th most protective textile against sharp and blunt, and tied 3rd against heat. It is also the 4th best cold insulator in the game, and the only thrumbofur provides both superior protection and cold insulation. While its heat insulation is mediocre, it is still one of the best balanced textiles between protection and insulation and provides approximately 15% more item hit points than other leathers. It is a very good candidate for Dusters and clothing in the early game. However, outside of cold biomes 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 heavy fur 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. In cold biomes its lifespan may be longer as heavy fur tribalwear can allow a pawn to survive without having to sacrifice the greater protection from a duster of a stronger material for something warmer. In very cold biomes, very warm materials on all items may be required to survive. In such instances, heavy fur's particular stat balance excels.
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.
Heavy fur is a new leather type added in 0.19/1.0. It merges the different fur types from large animals from earlier versions. [Fact Check Needed]