EcoFoil Double Bubble Foil Insulation is very thin (1/4" to 5/16"), with a foil surface on each side. This insulation is rated and tested by reflectivity and emissivity. It is 96% reflective and 4% emmissive, meaning the product only allows 4% of radiant heat to pass through it. To put it simple, the insulation does not try to slow the way heat passes through it, the insulation tries to eliminate heat from passing through it.

This insulation is constructed of a double layer of polyethylene bubble insulation, bonded to two radiant barrier metalized sheets. The insulation not only works well to reflect radiant heat, but it also works as a vapor barrier, preventing condensation which can cause mold.