Ants (and all insects) are cold blooded so they don't keep their bodies warm.
The fur on their bodies keep them warm.
Warm bodies , they have fur to keep them warm.
They have Fur to keep their bodies warm.
Lots of layers help keep bodies warm, and minimizing the time out of doors.
To keep warm of your body
keeping warm
In all probability, when these fibres were made into clothing designed to keep bodies warm: yes.
No they are not.
No because they have short stocky bodies to keep them 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.
by the fat on the bodies and food and water
Fats stored in their bodies when awake is converted to energy to keep them warm and alive.