Key takeaways
- DWR is a coating on the outer fabric that makes water bead up and roll off.
- It keeps the face fabric from 'wetting out', preserving breathability in waterproof-breathable gear.
- DWR wears off over time with abrasion, dirt, and washing — it's not permanent.
- Restore it by cleaning the garment and reapplying DWR (wash-in or spray-on), often with heat to reactivate.
Durable Water Repellent.
What DWR is
DWR — Durable Water Repellent — is a coating applied to the outer face fabric of jackets, tents, and gear that makes water bead up and roll off instead of soaking in. It’s what makes rain bead on a new rain jacket. Importantly, DWR is separate from the waterproof membrane underneath — it treats the surface fabric.
Why it matters (and wets out)
DWR is essential to how waterproof-breathable gear performs. When it wears off, the face fabric absorbs water — ‘wetting out’ — and even though the membrane still blocks rain, breathability collapses and you feel clammy inside. People often mistake this for the jacket leaking. DWR degrades with abrasion, body oils, dirt, and washing, so it’s not permanent.
After a few seasons, a hiker notices rain no longer beads on their shell and they feel damp inside. They wash the jacket to remove grime, reapply a spray-on DWR, and tumble-dry it on low to reactivate the coating — and water beads and breathability return.
How to restore it
Clean the garment first (dirt and oils kill DWR), then reapply a wash-in or spray-on DWR, often reactivating it with gentle heat per the care label. Modern treatments are increasingly PFAS-free. Maintaining DWR is key to keeping Gore-Tex and other shells working.
The bottom line
DWR is the unsung coating that makes water bead off your gear and keeps waterproof-breathable jackets actually breathable — without it, the face fabric wets out and you feel clammy even though the membrane holds. It's not permanent: clean your gear and reapply DWR when water stops beading, and your rain shell will perform like new again.
Frequently asked questions
What is DWR?
DWR (Durable Water Repellent) is a treatment applied to the outer fabric of jackets, tents, and gear that makes water droplets bead up and roll off instead of soaking in. It's what you see when rain beads on a new rain jacket. It works alongside, but is separate from, the waterproof membrane underneath.
Why does my rain jacket stop repelling water?
Because the DWR has worn off. Abrasion, body oils, dirt, and washing gradually degrade the coating, so the outer fabric starts absorbing water ('wetting out'). Even though the membrane still keeps rain out, a wetted-out face fabric blocks breathability, making you feel clammy inside — which people often mistake for the jacket 'leaking'.
How do you restore DWR?
First clean the garment (dirt and oils kill DWR), then reapply a DWR treatment — either a wash-in product or a spray-on for the outer surface only. Many DWR finishes are reactivated with gentle heat, such as a tumble dry on low or a warm iron with a cloth, following the garment's care instructions. Modern treatments are increasingly PFAS-free.
Sources
- DWR & waterproof fabrics — Gore-Tex
- Gear care — The Mountaineers