Super TUFF-R 2 in. x 4 ft. x 8 ft. R-13 Rigid Foam Board Insulation 99060464 - The Home Depot
RMax Thermasheath 4ft x 8ft Polyiso Rigid Foam Insulation Board - All
Black Foam Sheets Self Adhesive Black Foam Padding Insulation Foam Sheets Neoprene Rubber Foam Sheet Anti Vibration Anti-Slip Foam Pad for Craft Furniture (8 Pcs, 4 x 4 x 3/4 Inch): Amazon.com: