Rubber-Cal Closed Cell Sponge Rubber Neoprene 1/2 in. x 39 in. x 78 in. Black Foam Rubber Sheet 02-128-0500 - The Home Depot
Closed Cell Foam: Types, Applications, Benefits, and Manufacturing
Foamzz by Big UGGLY High-Density Foam Panels, Closed-Cell Insulation Foam Pads, Black, 12" X 12" X 1" (2 Pack): Amazon.com: Industrial & Scientific
Foam Ninja Polyethylene Foam Sheet 12 x 12 x 1/2 Inch Thick - 2 Pack Black Charcoal - Custom Foam Inserts High Density Closed Cell PE Case Packaging Shipping: Amazon.com: Industrial & Scientific