To change the cover or wash it, first remove the ring, connected to the cap, that encircles the valve. Remove the cover from the pocket. The cover can be machine washed at 30°. The plastic bag can be washed with a damp sponge. Never immerse it!
To replace the cover over the air bag, slide the air bag into the cover without the cap. Insert the valve without the cap into the hole in the fabric. Replace the cap ring around the valve from the outside.