Please check the care label of your product first. For some down products tumble drying is not allowed. In this case please refer to the point:„How to dry my down product by hand“ In case tumble drying is allowed: 1. Place the product in a tumble dryer WITH 3 tennisballs. The tennis balls are vital to give sufficient mechanical movement to re-establish the down shape and placement in the chambers.  2. Set the Tumble dryer program to low heat and low speed (often down or wool program).  Start with a 30 minute cycle. The process can sound very noisy, you can add a few tea towels to absorb some of this. But do not overfill. The down product must have room to regain its volume.  3. After this take out the product and evaluate its condition, you can repeat the process as described above until its dry. Only when it is completely dry and fluffy hang the product on a regular coat hanger in a dry location for the down to cool off and relax to regain its optimum state.  After tumble drying it is recommended to air item(s) – eg on a regular coat hanger – for at least one day in a warm and dry location prior to packing away