Styles lined with real down or feathers needs special treatment during washing and drying.
Use a special down detergent to hand wash in lukewarm water or wash separately in the washing machine on the mildest program, also using a special down detergent.
Shake the style and the downs periodically when hung to dry or tumble dry the style at a low heat with tennis balls or shoes.
Treat with water repellant spray. Do not fold or put in a bag when still damp. Do not iron.