KORETEX TEXTILE GROUP

How to Test and Maintain DWR for Optimal Performance
Learn how to test your DWR coating, refresh it using heat, and use the best DWR treatments to maintain its waterproof properties.
























How to Test and Maintain DWR for Optimal Performance

When your waterproof jacket or boots stop getting as wet as before, it doesn't always mean it's time to replace them—it might just be time to restore your Durable Water Repellent (DWR) coating. DWR is a key part of the performance of waterproof clothing and footwear, helping moisture condense and roll off the surface while also allowing it to breathe, keeping you dry and comfortable. Over time, contact with dirt, grease, and repeated use wears down this protective layer. However, with proper care, you can easily test and maintain your gear's DWR to keep it performing at its best. In this guide, we'll show you how to test your DWR, the simple steps to maintain it, and the best ways to give your gear lasting protection on every adventure.

What is DWR and How Important Is It?

Durable Water Repellent (DWR) is a key finishing agent applied to the outer surface of waterproof clothing and footwear, causing water to roll off rather than soak into the fabric. This invisible coating helps waterproof fabrics retain moisture, acting as the first line of defense against rain and moisture. While the underlying waterproof membrane provides the primary waterproof barrier, DWR plays a crucial role in ensuring breathability by preventing the outer fabric from saturating, thus blocking moisture and hindering airflow. However, frequent abrasion, washing, dirt, and exposure to harsh environments can cause DWR to degrade over time, resulting in water being absorbed to the fabric surface instead of beading. Without proper care, this decline in performance can make clothing and footwear feel heavier, colder, and less breathable in wet conditions, making regular DWR maintenance essential for maintaining comfort and protection.

How to Test a DWR Coating

Testing DWR is simple and can help determine if waterproof clothing or footwear needs maintenance. The easiest method is the water droplet test: lightly spray or pour a small amount of water onto the outer surface of your coat, trousers, or boots. If the water droplets roll off, your DWR is still effective. However, if the fabric starts to absorb water, darkens in color, or becomes damp, it indicates that the DWR has worn off and needs reactivation or retreatment. Another way to check is to observe how your gear performs in wet conditions—if you find that your jacket or boots feel heavy, cold, or not as waterproof as before, then DWR maintenance is needed. Regular testing helps ensure that your waterproof gear continues to perform at its best, rather than soaking into the fabric. This invisible coating helps waterproof fabrics retain moisture, acting as the first line of defense against rain and moisture. While the underlying waterproof membrane is the primary barrier against water, DWR plays a crucial role in ensuring breathability, preventing the outer fabric from saturating and thus blocking moisture and airflow. However, frequent wear, washing, dirt, and exposure to harsh environments can cause DWR to degrade over time, causing water to be absorbed to the fabric surface instead of condensing. Without proper care, this decline in performance will make clothing and footwear feel heavier, colder, and less breathable in wet conditions, making regular DWR maintenance essential for maintaining comfort and protection.

The Importance of Drying in DWR Maintenance

Proper drying is one of the simplest ways to maintain the DWR performance of your gear. Many DWR treatments are heat-start, meaning a quick spin in the dryer at low or medium heat restores the water repellency by resetting the treatment on the fabric surface. This simple step can often restore water droplets without requiring retreatment.

How to Properly Return Gear

To maintain the performance of waterproof clothing and footwear for the long term, proper care is essential. Begin by cleaning your gear, removing dust, oil, and dirt that may prevent proper DWR (Durable Water Repellency) treatment adhesion. Use a mild technical cleaner specifically designed for waterproof fabrics to maintain their integrity. After cleaning, apply a DWR treatment using a washable or spray-on product, depending on the type of gear. Washable treatments are suitable for garments such as jackets and trousers, while spray-on treatments are for footwear. Follow the product instructions carefully for best results and always ensure your gear is completely dry before reactivating the DWR in the dryer at low heat (if the care label allows). Regularly changing your gear helps maintain its water repellency, ensuring you stay dry and comfortable in all situations.

Maintaining DWR: Best Practices

Maintaining your DWR (Durable Water Repellent) coating is crucial to ensuring your waterproof clothing and footwear continues to perform at their best. To extend the life of your DWR, your gear must be cleaned regularly with a mild technical cleaner designed for waterproof fabrics, as dirt and grease can damage the coating. Avoid using regular household detergents or fabric softeners, as they can damage the DWR coating. After washing, always allow your gear to air dry completely before re-treating with DWR. If your garments begin to lose their water resistance, consider reactivating the DWR using a low-temperature setting in the dryer (if the care label allows), or using a spray or wash treatment to restore water resistance. Regular maintenance, including periodic re-treatments, ensures your clothing and footwear remain functional and reliable, keeping you dry and comfortable regardless of the weather.