Your footwear could be soaking up water just because it is dirty. First, try cleaning it with Nikwax Footwear Cleaning Gel™, and if it is fairly new, or recently re-waterproofed, the Durable Water Repellency (DWR) will be revitalised just from cleaning. But, once the footwear has been thoroughly worn you will need to add DWR by using Nikwax Waterproofing Wax for Leather™.
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 optimised for smooth leather footwear. The WaterBased formulation is directed to leaks, can be used on wet or dry leather and will not over-soften.