Nikwax says about the Fabric & Leather Spray-On
Easy to use spray-on waterproofing for all fabric, leather and combination footwear. Adds water repellency and revives breathability without softening leather. Enhances the performance of your footwear, keeping your feet warmer and drier. Recommended for Gore-Tex® and eVent®, Sympatex ® and all other waterproof combination footwear.