Let me explain:-
see, the hairs in between have air
so, we can say that the bodies of such hairy animals are covered with a layer of air.
This air covering is a great insulator of heat.
So, it does not allow the internal body heat(formed as a result of metabolic activities) to escape. Thus, the body is kept warm.

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The hair of certain animals like polar bears helps their body to keep warm.this hair helps the animal to get rid of the cold and keeps the body the hair will be covering the bodies of the animals like blankets and thus helps in keeping their body warm..

hope this helps pls mrk as brainliest.........

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