MYFIRESIDE DECK ARMORPROUDLY MADE IN THE USA heavy duty, triple layered heat shield that provides thermal protection for composite wood decks and temperature sensitive coatings on patios. The top layer is made from rugged volcanic rock fiber, which is naturally UV, weather and spark resistant. The middle layer is a continuous silica fiber insulative blanket with a 2000F service temperature. The bottom layer is a silicone coated fiberglass cloth that will not stain