Also leaves keep rose bushes from freezing. Fiberglass keeps the heat from getting out of your house, and it saves electricity. Dirt keeps the roots from freezing. Polyester is an insulator inside quilts to keep you warm at night. Styrofoam is used inside of coolers to keep your stuff cold.
Snow is another insulator.
Foam is an insulator because it traps air in it. Cotton is one, too. Fiberglass is glass that is in very little pieces. It works by trapping air. USA People put snow against their houses to keep their house warmer.