Thanks. If I do the frost king, should I still get the extra mass backing? I've never heard of frost king so I'll read up in it. Thanks again
I did 2 layers of frost king and mass backing you can never have enough sound deadening, our Jeeps are loud. Not to mention the mass backing also makes the carpet a heck of a lot more durable. This is just my personal opinion no actual facts, but it's pretty obvious when compared side by side. Now for the frost king it's a foam and foil self adhesive closed cell foam. It's normally used as metal duct wrap in hvac industry, also an assortment of other things. The product works great as sound deadning and insulating ,sticks great to floor(2 layers on floor it compresses), roof, firewall, doors, and other parts of cabin.