They have a woolly underfur for insulation. The bushy tail is black with pale brownish underfur. The coyote's fur consists of short, soft underfur and long, coarse guard hairs. The pelage is long and silky with a dense underfur. The fur is soft, with dense underfur and long, coarse, thick guard hairs. Their pelage is sparse and coarse with poorly developed or absent underfur. Long outer hair covers a short, dense, black and white underfur. The tip of the tail is black with white underfur. The underfur, which is soft and dense, serves primarily as an insulator. It consists of a combination of oily guard hair on top and thick underfur beneath. Its underfur is lighter near the base. The pelage is thick and luxuriant, with a dense underfur in a creamy color. The underfur is dense and loose fitting. Fur seals are characterized by their external pinnae, dense underfur, vibrissae, and long, muscular limbs. Its grayish coat mostly consists of dense underfur which insulates it against cold weather.