It is important to wash your waterproof or down-filled jacket when necessary to extend its life. In order to maintain the waterproof membrane, you should follow the manufacturer's instructions and use a specialty washing liquid. After the jacket is dry, you can re-treat it with a spray to maintain the DWR (durable water-repellent) coating. For down, it is recommended that you dry it on the gentle setting in a dryer and put a tennis ball in with it to break up the clumps of down.