Nowadays, almost all down products we sell are treated to be water-repellent. In the past, the biggest issue with down was its poor performance in damp conditionsmodern down products handle moisture much better. Nikwax Down Proof gives water-repellent properties to older down products and maintains/restores water repellency for garments and gear with treated down. Wash and treat your down products occasionally to get the most out of their performance. - Contains no PFAS compounds - Perfect for e.g. Nikwax Hydrophobic Down and Hydrodown products, compatible with all down items - Wash and treat your down items occasionally to get the most out of them - For best results, wash the item before treating - Do not use treatment and detergent in the same wash cycle Use in washing machine use: - Shake the bottle well - Remove detergent and softener residues from the machines compartments - Treat only one item at a time - Use the machines 30°C synthetic cycle with the slowest spin setti