I think it is dynamat. Anyway everything but the extreme is made of asphalt. The extreme is actually rubberized roofing material with a sticky backing. If you want to pay a ton of money for sticky backed asphalt or insulated rubber then buy dynamat.
Asphalt roll roofing material can be bought at any hardware store that sells roofing material. Applying it with stainless steel staples is far better than sitcky backed dynamat because you can remove it easily.