Understanding DWR and Its Importance

Your Gore-Tex jacket relies on a combination of its breathable waterproof membrane and an external Durable Water Repellent (DWR) coating. While the Gore-Tex membrane handles the primary waterproofing, the DWR is crucial for preventing the outer fabric from becoming saturated, a phenomenon known as ‘wetting out.’ When the outer fabric wets out, it loses its breathability, making you feel damp and cold even if the jacket isn’t leaking. Restoring a failing DWR coating is essential for maintaining your jacket’s performance and comfort.

Why DWR Fails and When to Restore It

DWR isn’t permanent; it wears off over time due to dirt, oils, abrasion, and repeated washing. If you notice water no longer beads up and rolls off your jacket but instead soaks into the outer fabric, it’s a clear sign that your DWR needs restoring. Don’t mistake a lack of DWR for a leaking membrane; often, a simple DWR refresh is all that’s needed to bring your jacket back to life.

Step 1: The Essential Cleaning Process

Before reapplying DWR, a thorough cleaning is paramount. Dirt, body oils, and detergent residues can hinder the DWR’s effectiveness. Always check your jacket’s care label for specific instructions, but generally, follow these steps:

• Prepare Your Jacket: Zip up all zippers, close any flaps, and loosen drawcords. Empty all pockets.
• Choose the Right Detergent: Use a technical wash specifically designed for waterproof breathable fabrics (e.g., Nikwax Tech Wash, Grangers Performance Wash). Avoid standard household detergents, fabric softeners, or bleach, as they can damage the membrane and leave residues that impair DWR.
• Machine Wash: Place your jacket in a washing machine (front-loader is preferred, top-loaders can be rough). Use a warm water setting (around 105°F / 40°C) and a gentle cycle. Rinse thoroughly to ensure no detergent residue remains. You might even run an extra rinse cycle.

Step 2: Reapplying DWR Treatment

Once your jacket is clean, it’s time to reapply the DWR. There are two main types of DWR treatments: wash-in and spray-on. Each has its advantages.

Wash-In Treatments

Products like Nikwax TX.Direct Wash-In are convenient. You simply run another wash cycle with the DWR product instead of detergent. This method ensures even coverage over the entire jacket. However, it will also treat the jacket’s inner lining, which might reduce its wicking capabilities, especially if it’s a fleece-lined jacket.

Spray-On Treatments

Brands like Grangers Performance Repel Plus or Nikwax TX.Direct Spray-On offer targeted application. This is ideal if only certain areas (like shoulders or elbows) show significant DWR wear, or if you want to avoid treating the jacket’s interior. Apply to a damp, clean jacket, ensuring even coverage. Hang the jacket on a hanger and spray from about 6-10 inches away, covering all external surfaces. Wipe off any excess or drips with a clean cloth.

Step 3: Activating the DWR with Heat

Many modern DWR treatments, especially those containing fluorocarbons (PFCs), require heat to activate and bond properly to the fabric fibers. Check your DWR product’s instructions and your jacket’s care label carefully.

• Tumble Dry: If safe for your jacket, tumble dry on a low to medium heat setting for about 20-30 minutes. The heat helps to redistribute and activate the DWR polymers. Avoid excessive heat, which can damage the membrane.
• Ironing (with caution): If tumble drying isn’t recommended or available, you can carefully iron your jacket on a low heat setting without steam, placing a towel between the iron and the fabric. This method also provides the necessary heat for activation.
• Air Dry (for some treatments): Some PFC-free DWR treatments, particularly those from Nikwax, are designed to air dry and do not require heat activation. Always consult the product’s instructions.

Ongoing Maintenance Tips

To prolong the life of your newly restored DWR:

• Wash Regularly: Don’t let dirt and oils build up. Wash your jacket periodically with a technical cleaner.
• Avoid Contaminants: Try to keep your jacket away from bug sprays, sunscreens, and other chemicals that can degrade DWR.
• Spot Clean: For minor dirt, spot clean with a damp cloth instead of a full wash.
• Store Properly: Hang your jacket in a well-ventilated area, away from direct sunlight or extreme temperatures.

Conclusion

Restoring the DWR on your Gore-Tex jacket is a straightforward process that can significantly extend its functional lifespan and keep you comfortable in adverse weather. By following the steps of thorough cleaning, careful application of a DWR treatment, and proper heat activation, you can bring back that satisfying water-beading performance and ensure your investment continues to protect you on your adventures.