If you horse around with trail stock or you need a safe and dependable treatment for restoring water repellency to your synthetic horse blankets, outdoor tarps and shelter material, this 33.8 oz. bottle of Nikwax Synthetic Rug Proof reinforces fabric under the weather. Its even specifically formulated so it wont stifle GORE-TEX and other breathable fabrics. The generous 33.8 oz. capacity is more than enough to treat gear through several monsoon seasons.