Bubble / Foam insulation provides the maximum efficiency in controlling heat transfer as the air space built between the layers of foil works to keep radiant heat from penetrating a structure from the outside, and the radiant foil reflects interior heat back into a structure from the inside. Even though you get single bubble and double bubble insulation and 5mm to 25mm EPE Foam insulation. Technical Specifications: Three layer of air bubble film laminated with both side silver metalized aluminum film. Our Product is Specially Designed for construction, container insulation. insulated bags manufacturing etc. Standard Size : 1.2mtr x 100mtr Bubble Size : 4mm x 10mm Nominal Thickness : 3.5 to 4mm Reflection Ratio : 96% Thermal Resistance Emissivity : 0.04-0.05