Reflectix. Reflective Insulation consists of two layers of 5/16-inch-thick polyethylene “bubble wrap” with a reflective foil layer bonded to one or both exterior faces. It helps to reduce heat loss by reflecting away up to 96% of radiant energy, while air trapped in the bubbles blocks conductive heat transfer with R-values up to 4.55. Flexible and versatile, it can be installed in most building applications to block heat loss or gain around ductwork, water heaters, and pipes. It meets fire, smoke, and building code requirements, as verified by RIMA International, and is Energy Star qualified for residential applications. 800.879.3645.