That's just bubble wrap with foil on both sides, Right?
You can get some "Frost king" Duct insulation, Its self adhesive on one side then closed cell foam & semi-thick aluminum foil on top.
I coated my ENTIRE truck in 2-3 rolls iirc.
Its a hell of a lot cheaper then dynomat & REALLY cuts the road noise. Now my trucks actually pleasant on the highway.