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

Fact 2: Wool and some of the new insulated fleece materials are good.

Given the two facts above, answer the question "What can be used to keep warm?" with the following options: 
- hair
 - eating steak
 - wool
 - fibers
 - hats
 - catching lobster
 - fueling cars
 - fur


 

   wool      