Your animal is most likely to get clammy and uncomfortable in wet or damp conditions if the breathability of their waterproof rug or coat is impaired. If the outer fabric absorbs water, the rug/coat can lose up to 70% of its breathability. Therefore, the Durable Water Repellency (DWR) on the outer fabric of your animal rug/coat must be maintained to ensure comfort. It will eventually wear off and need to be renewed with Nikwax Rug Proof. Nikwax Rug Proof adds Durable Water Repellency (DWR) whilst maintaining breathability. It is quick and easy to apply in the washing machine, and its DWR develops on air drying. It leaves a flexible water repellent treatment on individual fibres allowing moisture vapour to pass through, maintaining breathability, while protecting your animal from getting wet in the rain. Finally, washing machine application ensures that the treatment goes right through the rug or coat, treating seams, tapes and cords, as well as the fabric.