It is called blubber.
The layer of fat under their skin insulates them against the cold - just as it does in polar bears.
They have a thick layer of skin called blubber and they are warm blooded animals
Blubber is the layer of fat that keeps animals warm. These animals include polar bears, whales, and seals.
Perma frost
if you are asking how does it keep warm polar bears have a layer of fat which they use for insulation also there fur is pretty thick
It is not the fur that insulates the polar bear. The polar bear's skin is black, so it absorbs heat and keeps heat inside the body. The white fur is merely for camouflage.
polar bears
fish or other polar animals
Many animals including whales, seals, manatees and penguins have a thick layer of fat called blubber. Only marine animals have blubber (but not every marine animal). Blubber provides buoyancy, hydrodynamic shape, and stores energy.
Polar bears have white fur which lets them blend in with the snow. They eat seals and other arctic animals. They also have a thick layer of fat to help insulate them from the cold.
Depletion of ozone layer causes the ice caps to melt. This affects the polar bears.
they are tenuous cloud-like phenomena with a ragged edge of a much brighter and pervasive polar cloud layer called polar mesospheric clouds in the upper atmosphere, visible in a deep twilight.