Baby Seal

Physiology
Skin/Coat/Molting
Fur seals have both blubber and a specially adapted fur coat, including outer guard hairs that repel water and a layer of insulating underfur. For this reason they were particularly prized by sealers. Many species were nearly hunted to extinction.
For most pinniped species molting is an annual process of replacing worn fur (and in some cases, skin) that temporarily grounds them. Molting can compromise thermoregulation, so some species, such as Elephant seals, fast and remain onshore for a month or more.