The cover and filling need a compatible washing and drying method, and the appliance must permit the item's bulk. A cotton-looking cover does not describe the care of the filling.
Understanding this situation
Some items require particular drying steps to restore their intended condition, while others are unsuitable for a household machine. Guessing from a similar garment can lead to an uneven or damaged result.
A useful next step
Read the item's manufacturer guidance and the washer-dryer programme table before starting. If a suitable process cannot be confirmed, choose an appropriate specialist route. Do not force an oversized padded item through an ordinary continuous programme.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.