On older cars they were simple plastic wraps while on newer ones the protection is also somewhat sound deadening since it s made of foam or fiber materials.
Sound deadening door panels for more midbass.
Soundproofing rubber is typically a dense form of neoprene the same stuff they use in wetsuits to insulate against the cold.
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Usually it is easier to cut the mat into strips so that it can be easily slipped through the stamped holes on the inner sheet metal.
Check it out here edited january 13 2015 by second skin.
Most cars have another layer of protection under the door panels.
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Deaden the outer sheet metal of the doors.
If sound can leak around the sides of your door consider adding soundproofing rubber to the perimeter.
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Lift the protection under the door panel.
The screws will keep the plywood securely in place to absorb sound.
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Use a high quality sound deadening damping material and place it inside the outer sheet metal layer of each door or quarter panel.