packaging insulation for insertion into a packaging container , which includes an air laid thermoplastic fibrous batt having foldable thermoplastic film material adhered to both sides of the batt . preferably the thermoplastic material of which the fibers and film are made is the same , and most preferably it is pet . the resulting method and product provides packaging insulation which can be shipped flat and compressed , which expands when unpacked and which can be readily folded to match the interior configuration of a shipping container , such as a cardboard box .