Use sponge-on Nikwax Ski Skin Proof waterproofing solution to reinvigorate the DWR coating on your ski skins. Just like your rain coat, your skins come with a factory DWR (durable water repellency) coating. Over time wear and dirt prevents the DWR from working, Nikwax Ski Skin Proof is an easy way to breathe life back into soggy skins.