This 2-ply Techni Ice product is great for shipping food one way, packing in the freezer for holidays and travel in the car to keep items cold. The cloth on one side and heavy plastic on the other. The porous side easily absorbs and starts to expand which gives a larger surface area for better use. The frozen packs can be cut to size to use for sports injuries and other swelling. They can be used with hot water to keep food warm, cold water to keep food cold, and frozen to keep food frozen or to be used for injuries.