While the Down Wash is essential, you've got to think whether buying the Nikwax Down Proof as well is worth it. We've had it drummed into us that we
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Waterproofing treatment for down or feather filled clothing, sleeping bags, and comforters/duvets Helps revive insulating qualities while adding water
Nikwax Down Proof Wash-In Waterproofing Restores DWR Water Repellency to Down Filled Jackets, Outerwear, Vests, Sleeping Bags, Quilts, and Bedding
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