Does the BMW X3 have sound insulation cotton?

[Candice]

BMW X3 has sound insulation cotton. Functions of sound insulation cotton: Reduce and effectively alleviate metal fatigue in the chassis, extending the vehicle's service life. Metal fatigue occurs due to the uneven internal structure of metal, causing unbalanced stress transmission, where certain areas become stress concentration zones. After soundproofing the doors, the inner cavities of the doors are effectively filled, making the closing sound extremely dull and solid, changing from a "clang" to a "thud," eliminating the previous tinny noise. Types of sound insulation cotton: There are mainly two types: one is vehicle-specific sound insulation cotton, mostly made of plastic flocking and high-temperature resistant flame-retardant cotton; the other is freely cuttable aluminum foil sound insulation cotton, made of aluminum foil and foam flame-retardant materials.