After a walk in the rain, dark wet spots remain on the shoulders and cuffs of your jacket, even though the clothing underneath stays dry. In most cases, the problem isn't the membrane, but the outer water-repellent finish — DWR (Durable Water Repellent). Friction, washing, and everyday use gradually wear this layer down, especially in areas where backpack straps rub and on the cuffs. The good news is that in most situations, properly washing the jacket and applying a new waterproofing treatment is enough to make water bead up and roll off the fabric again.
Waterproofing vs. Membrane: What's the Difference
A DWR label in a jacket's description means the outer fabric has been treated with a water-repellent compound that prevents water from soaking in, forcing it to form droplets instead. In a waterproof breathable jacket, rain is blocked by a separate membrane layer located underneath the fabric. Therefore, even if the membrane is in perfect working order, the jacket can still wet out on the outside and feel heavier — this isn't a sign of damage, but a signal that the exterior coating has worn thin. The distinction between the functions of waterproofing and the membrane is explained in detail in the care guide by the Norwegian brand Norrøna.
Cleaning Before Waterproofing
Even if the DWR treatment hasn't technically worn off yet, the fabric may start absorbing water due to contamination: body oils, dirt, and sunscreen residue. That is why manufacturers like Patagonia recommend starting the care process with a thorough wash. For a membrane jacket, you should choose a liquid detergent specifically designed for such garments, and check the care label for the correct washing temperature. Waxed cotton requires different rules: the manufacturer advises cleaning stained areas by hand and reapplying the wax layer when necessary. Machine washing, tumble drying, and ironing are strictly forbidden for waxed jackets.
How to Test If the Coating Is Working
Once the washed jacket is completely dry, perform a simple test recommended by Arc'teryx: lightly spray water onto the shoulders, sleeves, and other areas that previously got wet. If the droplets bead up, the coating is still working. If the water spreads across the surface and soaks into the outer fabric, it's time to apply a new waterproofing treatment. Before treating, make sure to inspect the inside of the jacket: if the seam tape has peeled or the fabric layers have separated, a spray won't fix the issue — in this case, you should contact a technical gear repair specialist or the manufacturer.
Applying Waterproofing: Spray vs. Wash-In
For a jacket with a lining that wicks moisture away from the body, using a spray is the most convenient option: it treats only the outer fabric without affecting the membrane. If the clothing manufacturer allows treating the entire garment in a washing machine, a compatible wash-in product will work. When applying a spray, such as Nikwax TX.Direct Spray-On, follow the instructions on the bottle: spray distance, waiting time, and drying method can vary between different formulas. After complete drying, repeat the water test to ensure the droplets bead up once more.
Special Cases: SHAKEDRY and GORE-TEX
For jackets featuring a GORE-TEX membrane with an outer textile layer and DWR treatment, the care routine depends on the specific manufacturer's instructions — always check the label first to see if tumble drying and ironing are permitted. SHAKEDRY jackets have the membrane on the outside, so these models must only be air-dried. They cannot be machine-dried, ironed, or treated with standard DWR sprays. Ignoring these restrictions can permanently damage the jacket's construction.
