Your question makes no sense please reword the question.
Its fur and blubber keep its body heat from escaping the body.
Mammals need to keep their body warm and it is possible by the body covering they have...fur and hair
We are mammals and mammals are land creatures. We have hair to keep ourselves warm.
To keep heat from escaping your body to prevent your body from shutting down and you dying.
A good time for a person to wear a thermal shirt is when the weather is around 0 degrees. The thermal shirt is used to keep in the body temperature, which is effected badly by the cold weather due to it escaping the body into the surroundings. Thermal shirts keep the body temperature from escaping so quickly and keep the person warm.
All aquatic mammals keep warm by trapping the heat they generate under a layer of fat called blubber. The blubber keeps their heat from escaping and thereby keeps their bodies warm.
They are mammals and mammals have fur on the body. And also, the fur on them is too keep themselves warm at arctic regions because these regions too cold regions
Snakes aren't mammals because they are cold-blooded and covered in scales. Snakes rely on the sun to keep their body temperature regulated. Mammals are warm-blooded and able to more easily regulate their own body temperature.
The brain of mammals keeps track of the temperature of the skin and blood to maintain a stable internal body temperature, which is crucial for the body to function properly.
Heat is escaping your body.
Blankets keep you warm by trapping and retaining your body heat. The material of the blanket acts as an insulator, preventing heat from escaping and creating a barrier between you and the colder air around you. This helps to maintain your body temperature and keep you cozy and comfortable.
All mammals are endotherms. They are able to regulate their body temperature and maintain homiostasis. Say the temperature drops to a chilling 30°F, their body will try to keep them warm by staying at a constant temperature.