The felt/carpet/trim that is under the dash and over the pedals... How do you actually call this part? I've been trying to find a replacement for ages, but can't find it. Probably can't find a suitable search term either.

the original part is under a centimeter thick and reasonably stiff. When it has gotten wet many times over the years, it has lost its' strength and become over 2cm thick soft fluffy blanket at places.

Is there any proven method to restore the strength and look?