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.
Mk7 door panel sound dampening.
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Use these panels to block sound leaking through any rectangular or squared opening.
Most cars have another layer of protection under the door panels.
Plan is to pull off the white sound deadening pad dynamat most of back of the door panel put the white pad back on and see what that does.
Also bought a roll of felt tape to maybe put on some of the mating surfaces of the door panel and trim.
Excellent for windows doors and openings.
Sound absorbing acoustic insulation wall panels 2 pack model 02520 view the owens corning sound absorbing acoustic panels.
Zhermao 24 pack acoustic panels sound proof padding 12 x 12 x 0 4 inches sound dampening panels bevled edge sound panels acoustic treatment used in home offices grey 5 0 out of 5 stars 1 59 99 59.
Door panels are on the list for me this spring.