I have a newbie question. In my James Cook I have found a large silver fabric panel. It is not the insulated one that goes on the front windows, but it does have Westfalia logos on it, so it must be part of the van. It is approximately 1.5m square, and has Velcro fasteners on it. I have no idea what this is, and the manual is only in German, so that doesn't help me. What is this for?

Thanks
