Nikwax Down Proof - Impregnation to be used on down clothing and sleeping bags to restore the impregnation and properties of the down. Down Proof is used after washing with Down Wash Direct, and the result is an outer fabric and down that is very water-repellent. Volume: 300ml Nikwax has always put the environment in focus and all products are: Water-based, climate-neutral, biodegradable, flame-resistant, not tested on animals and not least completely free of fluorocarbons.