Nikwax Rug Proof Waterproofing Makes all types of horse blankets highly water repellent and maintains breathability to keep horses dry and comfortable For lined or unlined horse rugs and blankets Easy wash-in application; Machine wash safe Recommended for all synthetic, canvas, cotton, lined, or unlined horse rugs and blankets; Ideal for Gore-tex and Rambo Water based, biodegradeable, and contains no PFCs or VOCs