What is described as the finer fur next to the rabbit's skin?

The undercoat is the layer of fur that lies close to a rabbit's skin, providing insulation and warmth. This layer is typically softer and denser than the outer layer, which helps to keep the rabbit comfortable in varying temperatures. The undercoat plays a crucial role in a rabbit's ability to regulate its body temperature, making it an essential aspect of their coat structure. Understanding the rabbits' fur composition is important, especially in terms of care and grooming, as proper maintenance of the undercoat can enhance the overall health and appearance of the rabbit. The other terms, such as guard coat and outer coat, refer to different layers or types of fur that serve distinct purposes, such as protection and aesthetics, rather than the fine fur close to the skin.