It combines sound deadening and very good heat shielding. The aluminium is much thicker. The other products have less or no alumnium sub strat and work like those cheap astronaut thermal blankets e.g. they do not work. And do not stand up over time and some of them bunch up and buckle in high traffic area like the drivers side front seat.
Pontiac orginally had a craft paper backed tar like panels pasted to the floor pan and the carpet had a jute backing. Those together sorta kinda worked. For the cost of the jute pad and repop craft paper backed tar like panels - just get the dynamat extreme for a few dollars more
High end resto shops use it by the ton.
CAVEAT- it is hard as hell to remove and because of the thickness of the aluminum backing I had to use a dead fall rubber hammer to get it to fit around the seat supports. Also you need to plan ahead for bolt holes in the floor pan, particularly around the seat belt anchors
