When the down jacket is thrown dry, it will produce a large amount of gas that cannot be discharged. When it exceeds the limit, it will appear like an explosion, which is extremely dangerous. Therefore, some washing machines clearly state in the manual that they cannot wash down jackets. In addition, due to the high moisture content of wet down jackets, and some down jackets have a coated outer layer with waterproof function, water is not easily thrown out, and down jackets will become thicker. If placed improperly in the spin dryer, it is highly likely to cause the spin dryer to rotate and collide with the washing machine casing.