Rain jacket letting water through? Try this easy 20-minute trick to fix it!

Every autumn, it happens again. You head out into the rain, only to find your jacket's shoulders getting darker and wetter instead of letting water roll straight off. After a while, the fabric feels cold and heavy, and you start wondering whether your trusty rain jacket has finally reached the end of its life.

Before you spend money on a replacement or reach for another can of waterproofing spray, it is worth knowing that the problem might not be as serious as you think. Outdoor clothing manufacturers recommend a simple maintenance step that many jacket owners overlook.

Why is your rain jacket letting water through?

Most waterproof jackets have an outer coating called durable water repellent (DWR). It helps water form droplets that roll off the fabric rather than soaking in.

Over time, dirt, sweat, sunscreen and everyday wear can reduce the coating's effectiveness. The outer fabric then starts absorbing water, a problem often called wetting out.

According to GORE-TEX, this does not necessarily mean the waterproof membrane underneath has failed. Your jacket may still be waterproof, even if the outer fabric feels wet and clammy.

Try this easy 20-minute trick

Before buying a new jacket or applying another coating, try restoring the existing finish. GORE-TEX recommends washing the garment first, letting it dry, and then putting it in the tumble dryer for a further 20 minutes to reactivate the water-repellent treatment.

Here is what to do:

1. Check the care label. Make sure your jacket can be tumble-dried and follow its temperature instructions.
2. Wash it first. Use liquid detergent and avoid fabric softener, which can interfere with the fabric's performance.
3. Dry the jacket. Follow the manufacturer's instructions for drying it.
4. Apply gentle heat. If the care label allows it, tumble-dry the jacket for 20 minutes, following the manufacturer's guidance.

Don't have a tumble dryer? It is also recommended to try gentle ironing for suitable garments. Place a cloth between the iron and the jacket, use the recommended setting and avoid steam.

What if water still soaks in?

Once your jacket is clean and has been treated with heat, test it with a little water. If droplets still fail to bead up and roll off, the original coating may have worn out.

In that case, a suitable waterproofing spray or wash-in treatment may help. Follow the product instructions, including any advice about applying heat afterwards. Rab's reproofing guide explains how to restore the water-repellent finish on suitable jackets.

This maintenance can be particularly important for newer jackets with fluorine-free coatings, which may need more regular care.

The takeaway: if your rain jacket has stopped repelling water, don't assume it is ready for the bin. A proper wash and 20 minutes of carefully applied heat may be enough to bring back its water-repellent finish. Just check the label first, because not every jacket can handle the dryer.