Nikwax Nubuck & Suede Proof keeps your shoes waterproof while maintaining support and breathability. Add life to your footwear, especially items with breathable waterproof linings like Gore-Tex. It's easy to apply with the sponge-on application. It can even be used on wet footwear. Nikwax Proof is environmentally friendly and waterbased so it can be used indoors unlike solvent based sprays. It does NOT contain fluorocarbons, is biodegradable, non-flammable, and non-hazardous.