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.
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
polar bears
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.
fish or other polar animals
Three arctic animals that have blubber besides a polar bear are seals, walruses, and whales. Blubber is a thick layer of fat that helps these animals insulate their bodies and stay warm in the cold Arctic waters.
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 a thick layer of fat, called blubber, that helps them stay warm in their Arctic habitat. This layer of fat also serves as a source of energy when food is scarce. The blubber can make up about one-third of a polar bear's body weight.
Polar bears are best known for their impressive adaptations to life in the Arctic, particularly their thick white fur and a layer of blubber that insulates them against the cold. They are powerful swimmers, often covering long distances in search of food, primarily relying on seals as their main diet. Additionally, polar bears are iconic symbols of climate change, as their habitat is increasingly threatened by melting sea ice.
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.