Performance: consist of one or two layers of air bubble sandwiched between layers of aluminum foil Characteristics: the bubble contains an air retention layer designed to provide increased strength and puncture resistance and provide a greater reduction of heat transfer. The aluminum foil is an effective barrier against moisture, air currents and vapors. Aluminum foil reflective insulation, which can reflect up to 97 percent of the radiant energy that strikes it, has proven to be an outstanding radiant heat barrier. Keep summer heat out and winter heat in so to help keep houses cool in the summer and warm in the winter Application: used in residential construction in attics, walls, ceilings, and radiant floor heating applications. Also used in industrial/commercial buildings, agricultural buildings, and warehouses. Structure: foil/bubble/foil Foil/bubble + bubble/foil Etc Packed by plastic bag