Nikwax Down Proof

Use Nikwax down proof to stay warmer longer in wet weather.
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Nikwax makes a number of products that can increase the longevity of your gear and improve your gear's performance in the field. Nikwax down proof helps your down jacket retain more of its insulation capabilities if it gets wet. The down proof coats individual down filaments with a waterproof coating that allows your garment to continue performing even in damp conditions.

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How long will this work for?