Machine-wash: Machine-wash your down jacket on a gentle cycle at 30 degrees °C. If it’s available, select the ‘extra rinse’ option. Use a down-specific soap or detergent, like JOBY’s soap products. Skip the spin cycle. It’s better for your jacket to drip dry and/or use a tumble dryer.
Hand-wash: Soak your down jacket for up to 60 minutes in a sink. Again, go for a down-specific detergent such as Granger’s Downwash. Rinse by lightly squeezing out excess water (don’t wring it!) and follow the drying steps below.
Drying: Once the wash is complete, carefully remove your jacket — it’ll be heavy — and lay flat to dry on a clothing rack. As you do this, gently fluff up the down. It’ll take around 24–48 hours to drip dry depending on the weather conditions.
As it dries, keep giving it the occasional fluff, particularly around any wet clumps of down. When the jacket is almost dry, put it in the tumble drier on a low heat and check it regularly. To maximize the loft of your down jacket, throw in two to three tennis balls. This will really help fluff up your down jacket.