This single bubble aluminum foils insulation product consists of 1 layer of 3mm or 4mm polyethylene bubble that is sandwiched between one aluminum foil, low emissivity surface and one layer of puncture resistant, chemically stable, white polyethylene. The purpose for installing Reflective Bubble White Poly in a concrete slab application is two-fold, first, it acts as a vapor retarder and second, it provides a thermal break.