The Fabric & Leather Proof from Nikwax is specifically for waterproofing fabric and leather combination boots. A water-based treatment that provides maximum waterproofing with minimal change to the look and feel of nylon and leather footwear. Can be applied to wet or dry footwear. Ideal for any lightweight boot, and is safe to use on footwear with breathable membranes such as Gore-Tex, SympaTex and eVENT.