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In addition to having a large amount of hair, Polar bears have hollow fur. this allows more heat to be trapped in the fur as air is a good insulator
they have two layers of fur (just a guess)
there fur is like a whale it has blubber and its thick
Polar bears have very thick fur so that helps. The fur holds air and serves as insulation that holds in body heat. It is like a coat on a human. They also have black skin underneath that white fur and the sun glares on the black skin, helping them to stay warm.
because polar bear fur is hollow, and air is a good conductor.
The thick coat of fur traps air that is a poor condutor of heat which slow down the heat loss from escaping quietly from the grizzly bear's body to the cold surroundings, thus keeping the grizzly bear warm.
The polar bears coat is about 2.5 to 5cm thick. So they must be pretty warm.

Polar bears have transparent fur over black skin. Reflection of the sunlight from the densely packed transparent hairs makes polar bears seem to be white. The bears' black skin absorbs heat from the sun. The transparent fur is made up of hollow hairs called guard hairs. These air-filled guard hairs help transmit heat from the sunlight to the polar bear's black skin as a solar heat collector. In turn, the reflection stops the heat being lost from their black skin.
Polar bears have transparent fur over black skin. Reflection of the sunlight from the densely packed transparent hairs makes polar bears seem to be white. The bears' black skin absorbs heat from the sun. The transparent fur is made up of hollow hairs called guard hairs. These air-filled guard hairs help transmit heat from the sunlight to the polar bear's black skin as a solar heat collector. In turn, the reflection stops the heat being lost from their black skin

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6y ago
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12y ago

They keep warm because of their thick ,warm fur.

transparent fur over black skin.

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10y ago

The fur of a polar bear helps to keep it warm by keeping the warm air on its body. This keeps the heat in, and allows the bear to remain warm without losing body heat.

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Q: How does the polar bear's fur keep it warm?
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