The Nikwax Down Care Kit contains a 300ml bottle of Down Wash and a 300ml bottle Down Proof. Down Wash is a non-detergent, biodegradable liquid soap that removes dirt, body oils and detergent residues that contaminate the down, causing it to clump together and lose its loft while keeping the water-repellent finish intact. Down Proof adds water-repellency and revives breathability to your down items. Down Proof lasts for several washings and does not need to be reapplied after every wash.