The Nikwax Fabric & Leather provides maximum waterproofing with little or no change to appearance or texture of leather or fabric. Long-lasting waterproofing that conditions without softening. Water-based formulation is preferentially drawn to areas that need it most. Breathable treatment is safe to use on footwear with waterproof breathable linings and waterproof leathers. For best results, apply to damp leather and fabric to treat the areas that water would enter.