I know it is the outsoles and not the insoles, but knowing hundreds of peoples feet as the composition for the sound deadening is in my car would not sit well with me knowing it is a new car, and one that would be fairly expensive.
Why?
That material is absolutely perfect for sound deadening. Its not like you'll actually see the material.
When your garage door vibrates too much, what do you do? Put a piece of rubber between the opener and the braces it hangs from. There are countless examples of this, and this material is really ideal for killing NVH problems.
BTW -
the material from the nike shoes?
Also what many new athletic tracks are made of and the same stuff as you see spray out of the field on new football fields covered in fieldturf.
Great stuff...