Some people think straw is not an insulator, but it is. When a cow is cold, it will lay down in straw and get warm. Some furniture that you have may have foam in it. Fiberglass is an insulator for your house. Also, fiberglass can make people itch.
Snow can insulate the ground.
You can insulate yourself by covering with a blanket. Straw is also an insulator. USA There are lots of different insulators. Fiberglass insulates your home and is very itchy. Another insulator is paper.