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. Nikwax Waterproofing Wax for Leather has been specifically designed and optimised for smooth leather footwear, the water based formulation is directed to leaks and can be used on wet or dry leather and will not over-soften.