ondervacht
Ondervacht is a Dutch term meaning under fur, referring to the dense, soft undercoat of mammals with fur. This layer lies closest to the animal’s skin and provides insulation by trapping air to retain heat. It is contrasted with bovenvacht, the outer fur composed of longer guard hairs that offers protection from the elements.
In the fur trade and textile production, ondervacht denotes the inner fur layer that is separated from
Historically, the term is used in Dutch-speaking regions and appears in zoological, trade, and fashion literature.