If the NECK-PRO head restraints were triggered during an accident, you have to reset the head restraints for the driver and front passenger seats. Otherwise, this additional protection will not be available during a later rear end collision. Triggered head restraints can be recognized by the fact that they are moved forward and can no longer be adjusted.
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Mercedes-Benz C-Class (W205) 2015 - 2021 Owners Manual > Seat belts: Fastening and adjusting the seat belts
If the seat belt is pulled quickly or sharply, the seat belt retractor locks. The seat belt strap cannot be pulled out any further. Always engage seat belt tongue 2 of the seat belt into seat belt buckle 1 of the corresponding seat. Press and hold the seat belt outlet release and slide seat belt out ...