Another insulator is leaves. Leaves keep animals warm. Leaves also keep the ground and plants warm. Squirrels build nests with leaves. Leaves keep sprouts from dying in the spring.
Snow can keep the ground from freezing.
Fiberglass keeps our house from getting cold. The carpet keeps our feet warm. Styrofoam is used in cups to keep things hot or cold. Some styrofoam is easy to tear apart. You can paint it any color, if it is white.