Nikwax Conditioner for Leather is a sponge-on conditioning liquid that restores the suppleness of smooth or waxed leathers. It also waterproofs and helps revive breathability, making it great for breaking in new boots and tack. This conditioner is suitable for all full grain leather footwear, including work, fashion, and sports shoes, and is safe to use on footwear with breathable membranes like Gore-Tex, SympaTex, and eVent. It can be used on both new and worn leather to prolong life and performance, revitalizing dried out or cracked leather and maintaining the structure to prevent cracking. The product is easy to apply indoors, is water-based, environmentally friendly, biodegradable, non-flammable, and non-hazardous, without containing fluorocarbons. For best results, clean footwear with Nikwax Footwear Cleaning Gel before application. Recommended for use with Gore-Tex® & SympaTex® footwear. For nubuck and suede leather, use Nikwax® Nubuck & Suede Proof. For fabric and leather, use Nikwax® Fabric & Leather Proof.