Why is cardboard good in an isulator?

Cardboard is a good insulator because it is composed of cellulose fibers that trap air, which reduces heat transfer. The air pockets within the cardboard create a barrier that slows down the conduction of heat, making it effective for thermal insulation. Additionally, cardboard is lightweight and non-conductive, which further enhances its insulating properties. This makes it useful for various applications, such as packaging and building insulation.