Foil Insulated Box Liners, 11" x 8" x 6" - 25/Case (Fits in USPS Priority Mail Boxes) New "FOLD FLAT" Style for Added Insulation! Insulated Box Liners fold down for easy storage, taking up less warehouse space and reducing your inbound freight charges. Cool Blue insulation acts like a shield against the three types of heat transfer, conduction, convection and radiant. Foil reflects 97% of radiant heat. Heat reflecting technology outperforms foam, takes up a fraction of space, and costs less. Dirt smudges show easily on foam, while Cool Blue's shiny exterior provides a clean and pleasant presentation. Fits in USPS Priority Mail Boxes - Size: 11" x 8" x 6". *Box not included