Thermal Guard: Description
WARNING: This page is about a different car, the 2006 Chrysler PT Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
Courtesy of DAIMLERCHRYSLER CORP.
On gasoline engine equipped vehicles, a flexible thermal guard wraps around the battery case (2) to enclose the sides of the battery. The thermal guard (1) consists of a plastic cloth outer skin with a polyester based insulator fiber.