You just sprung for that pair of boots you'd been eyeballing, and it's time to apply some Nikwax Aqueous Smooth Leather Wax for waterproofing. Safe for use with Gore-Tex, eVENT, and Sympatex membranes, Aqueous Nikwax will help protect your new pair of boots and repel water before the moisture ever makes it to your waterproof breathable membrane.