stylistic:style_transfer, linguistic:voice_change, structural:expansion
Down hair

Down hair (also known as underfur, undercoat, underhair or ground hair) is the bottom – or inner – layer, composed of wavy or curly hairs with no straight portions or sharp points. Down hairs, which are also flat, tend to be the shortest and most numerous in the coat. Thermoregulation is the principal function of the down hair, which insulates a layer of dry air next to the skin.