The duvet fillings can be washed, but you must always follow the specifications on the label so as not to reduce the lifespan of the duvet. We recommend not to wash in the washing machine, if possible, wash it by hand or take it to the dry cleaners.
On the other hand, it's very important that you always make sure that it has been properly dried so that dampness does not cause mildew or damage. Drying and ironing specifications should also be taken into account.