I do believe that stuff is garbage and should not be kept in the cars. I've took it out of both my cars. The 88 had rust through the trunk and I do think that insulation had something to do with it. I am thinking about the "super insulation" it doesnt look like it will soak up water and hold it like the original mat.
Tru-Max BLIP12406 - Tru-Max Super Insulator Mats-Overview – SummitRacing.com