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. When you buy something that is cold, they put it in a paper bag to keep it cold. Another insulator is leaves.