Nikwax Waterproofing Wax for Leather is a safe product to use on breathable waterproof footwear. It provides instant Durable Water Repellency (DWR), maintains breathability and replenishes tanning agents in leather. It is non-flammable, contains no harmful solvents and is free of volatile organic compounds (VOCs) and fluorocarbons. Nikwax Waterproofing Wax for Leather has been specifically designed and optimized for smooth leather footwear. The WaterBased formulation is directed to leaks, can be used on wet or dry leather and will not over-soften.