Dry Guy Waterproofing Spray is specifically formulated for horse blankets. Each 16oz (473.1ml) bottle covers 50-60 square feet. This waterproofing spray is eco friendly, and does not use substances like PTFE, Teflon, or silicone. It does not change the texture of the fabric and still allows it to breathe. Waterproofing can last a whole year or longer with proper maintenance.