Metallic Foil Bubble Mailers, 8" W x 11" H - 5/Case COOL BLUE is the new green! Cool Blue insulation is made with recycled FDA approved plastic and reusable foil. Unlike traditional foam, Cool Blue insulation acts as a shield against the three types of heat transfer: conduction, convection and radiant. The bubbles and poly prevent conduction and convection heat transfer while the foil reflects 97% of the radiant heat. Extra protection! 5/8" foil laminated metalized bubble cushion with self seal adhesive strips. Foil Thermal Bubble Mailers are ideal for overnight boxes. *Pictures shown may vary by size