Nikwax Ski Skin Proof is a sponge-on waterproofing solution for your ski skins. This proofing repels water, helps prevent saturation, reduces kick, and enhances glide. Nikwax Ski Skin Proof prevents the build-up of ice in the fibers of your skins, helping to prolong the life and performance of your gear. Nikwax Ski Skin Proof can be used on all types of ski skins.