How do polar bears survive in such a cold environment?
user
They have really good fur and warm blood.
assistant
How thick is their fur?
user
It’s about 7cm thick.  They usually have a white layer of fur underneath.  It’s also fairly waterproof.
assistant
How do polar bears survive in such a cold environment?
user
They have really good fur and warm blood.
assistant
How thick is their fur?
user
As thick as they need to be for survival.
assistant
How do polar bears survive in such a cold environment?