Fact 1: Insulated material can be used for keeping warm.

Fact 2: Guard hairs protect the fur, while the fur insulates the mammal.

Given the two facts above, answer the question "What can be used to keep warm?" with the following options: 
- hair
 - fighting bears
 - lightning
 - hemp
 - coat
 - cooked food
 - wood
 - fur


 

        fur 