Aluminum insulation is available in two different styles and various size rolls. We refer to the first style as foil-bubble-bubble-foil? which consists of a double layers of polyethylene bubble that are sandwiched between two layers of PET aluminum radiant barrier foil . this style can be used in a variety of applications because its light weight and easy to handle. Yet provides superior protection. The double bubble lamination creates maximum R-value and the reflective foil on both sides allow it to reflect 97% of radiant heat away from a structure on the outside and back into a structure from he inside. this is why it works effectively in both hot and cold climates.