Rain Jacket Wetting Out: Causes & Fixes

Your rain jacket wets out when the outer fabric’s durable water repellent (DWR) coating wears off, causing water to soak into the face fabric and block breathability. You can fix it by cleaning the jacket and reapplying a DWR treatment. This article explains why wetting out happens, how to restore the coating, and how to prevent it from recurring.

What Does “Wetting Out� Mean?

Wetting out is the term for when water no longer beads up and rolls off the outer surface of a waterproof jacket. Instead, the face fabric absorbs moisture, appearing dark and saturated. This is often mistaken for a failure of the waterproof membrane, but in most cases the membrane is still intact—the DWR finish has simply worn off.

When the face fabric gets wet, it blocks the pores that allow sweat vapor to escape. This makes the jacket feel clammy and cold from the inside, even though no liquid water is actually leaking through. The result is discomfort and a false impression that the jacket is no longer waterproof.

How DWR Works

DWR is a chemical treatment applied to the outer fabric of a rain jacket. It creates a microscopic, water-repellent layer that causes rain to form beads and roll off. This is crucial because most waterproof membranes (like Gore-Tex or eVent) rely on the outer fabric staying dry to allow moisture vapor to pass through.

The DWR itself is not the waterproof layer—it is a “shedding� layer. The actual waterproofing comes from the membrane or coating beneath. DWR also helps the jacket stay lightweight and breathable; without it, the outer fabric saturates and traps heat and moisture inside.

Why DWR Fails

DWR degrades over time due to several factors:

• Abrasion: Rubbing against backpack straps, seat belts, or rocks wears away the coating.
• Dirt and oils: Body oils, sunscreen, and environmental grime can mask the DWR, preventing water from beading.
• Washing: Detergent residue and fabric softeners can clog the DWR or strip it entirely.
• Heat: Tumble drying on high heat or ironing can break down the chemical bonds.

Some jackets also have a factory-applied DWR that is not as durable as aftermarket treatments, so they may wet out sooner.

How to Fix a Wetting-Out Jacket

Restoring the DWR is a straightforward process, but it requires proper cleaning first. Follow these steps:

1. Clean the jacket: Use a technical cleaner (like Nikwax Tech Wash or Grangers Performance Wash) in a front-loading washing machine. Avoid top-loaders with agitators, which can damage the membrane. Set the machine to a gentle cycle with warm water (about 30°C / 86°F).
2. Rinse thoroughly: Run an extra rinse cycle to ensure all detergent is removed.
3. Apply DWR treatment: You can use a spray-on or wash-in DWR product. For spray-on, apply evenly to the outer fabric while the jacket is damp. For wash-in, add the DWR to the wash cycle after cleaning.
4. Heat activate: Most DWR treatments require heat to bond to the fabric. Tumble dry the jacket on low heat for 20-30 minutes, or use a warm iron (with a cloth barrier) on low heat. Check the jacket’s care label for specific instructions.

After treatment, water should bead up again. If it doesn’t, you may need to repeat the process or apply a second coat.

Prevention and Maintenance

To extend the life of your DWR and reduce the frequency of wetting out:

• Wash your jacket regularly (every 20-30 wears) to remove oils and dirt that degrade DWR.
• Use only technical cleaners—never regular detergent or fabric softener.
• Dry your jacket after each use, even if it’s just hanging it up, to prevent mildew and DWR breakdown.
• Store it loosely, not compressed in a stuff sack for long periods.
• Reapply DWR as soon as you notice water soaking in, rather than waiting for the whole jacket to wet out.

When Wetting Out Isn’t the Problem

If you’ve cleaned and reapplied DWR but water still soaks through, the issue may be:

• Membrane failure: Over time, the waterproof membrane can delaminate or develop pinholes, especially in older jackets. This is not fixable—you’ll need a new jacket.
• Seam tape failure: The tape over seams can peel or crack, allowing water to enter. This can sometimes be repaired with seam tape or a patch, but it’s often easier to replace the jacket.
• Excessive wear: If the fabric is abraded or torn, the waterproof layer is compromised. Small tears can be patched, but extensive damage means replacement.

If you suspect membrane or seam failure, test the jacket by placing a dry paper towel inside and running water over the outside. If the paper towel gets wet, the waterproof layer is compromised.

Frequently Asked Questions

How often should I reapply DWR?

It depends on how often you wear the jacket and how it’s cared for. A typical jacket may need reapplication every 6-12 months with regular use. If you notice water soaking into the outer fabric instead of beading, it’s time to reapply.

Can I use regular detergent to wash my rain jacket?

No. Regular detergents contain surfactants and fragrances that can strip DWR and leave residues that block breathability. Use a technical cleaner specifically designed for waterproof garments.

Will reapplying DWR make my jacket fully waterproof again?

Yes, if the waterproof membrane is intact. DWR restores the outer layer’s ability to shed water, which allows the membrane to work properly. If the membrane is damaged, DWR won’t help.

Can I put my rain jacket in the dryer?

Yes, but only on low heat and only if the care label allows it. High heat can damage the membrane and DWR. Tumble drying on low is actually recommended to reactivate DWR after treatment.

Is it normal for a new jacket to wet out?

No. A new jacket should have factory-applied DWR that sheds water effectively. If it wets out immediately, it may be a defect or the DWR was not applied properly. Contact the manufacturer for a warranty claim.

Can I use a waterproofing spray instead of a wash-in treatment?

Yes, both work. Spray-on DWR is easier to target specific areas, while wash-in treatments provide even coverage. Follow the product instructions for best results.

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