aluminum bubble insulation consists of one or two layers bubble  or foam that are sandwiched between layers of 99.9% pure aluminum radiant barrier foil . This style can be used in a variety of applications because of its thin, lightweight properties. The bubble layers creates Maximum R value and Vapor barrier , 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 the insides. This is why it works effectively in both hot and cold climates.