smelly carpets

Decided to tackle the smelly carpets in my TR7. I found felt carpet underlay which does not seem to be a very sensible material for an open top car.

As you can see the felt has stayed wet and gone rotten.  The white patches look like mildew.

The felt was fitted under all the carpet so looks like I will have to take out the lower centre console (with the radio) again to get the felt takes on the transmission tunnel.  Should have done it when I had all the fascia out to replace the heater matrix.

Found this label on the back of the trim piece just forward of the front of the doors in the footwell.

Now what to put instead of felt is the question.  I am thinking something like a Dynamat product would be good.