Poly Nylon Pan Liners are made from a tough 1 mil Polyethylene and Nylon material that provides a level of protection that can't be matched. Poly Pan Liners make clean up a breeze and save labor costs because they protect oven baking and roasting pans, steam table serving pans, cooking pots, baking sheets and more from cooked-on residue that can requires endless scrubbing. In addition to the savings in labor costs, there's also savings to be realized from reduced wear and tear on expensive pans and equipment. The liner bags are designed to perform in temperatures from 400 degrees F to -70 degrees F, so they can be used for short term food storage as well.