DWR vs. Membrane – What's the Difference?
By TaVare · updated 2026-07-27
A shell jacket keeps you dry with two completely different things: a membrane inside and a water-repellent (DWR) finish on the outside. They are often confused, but they do different jobs – and once you understand the difference, you also understand why a jacket 'soaks up' water even when it is perfectly intact.
The membrane: the waterproof barrier
The membrane is a thin layer inside the fabric with microscopic pores too small for water drops to get in, but large enough for water vapour (sweat) to escape. It is the membrane that makes the jacket both waterproof and breathable. It wears little with normal use, but can be damaged by holes, abrasion or incorrect washing.
DWR: the water-repellent surface
DWR (durable water repellent) is an invisible treatment on the outside of the outer fabric. It makes water bead and roll off instead of lying as a film. The DWR is worn by use, dirt and washing – and it, not the membrane, is what goes first.
Why the jacket 'soaks up' water even when the membrane is intact
When the DWR is worn, the outer fabric absorbs water and goes dark and heavy – called 'wetting out'. The membrane may still be sealed, so the jacket is not leaking, but it breathes worse and feels clammy. The fix is not a new jacket, but a wash and fresh proofing so the DWR beads again.
How to keep both in order
Keep the membrane fresh by washing the jacket clean (body oils and dirt clog it from inside). Keep the DWR in order with regular washing, heat activation and proofing when needed. If the jacket is technical or expensive, we clean and re-proof it according to the garment and its care label – you see the price before you order.
Frequently asked questions
Are DWR and membrane the same thing?+
No. The membrane inside is the waterproof, breathable barrier; the DWR on the outside makes water bead. They do different jobs, and the DWR wears first.
Why does the jacket soak up water when it is waterproof?+
Because the DWR is worn and the outer fabric absorbs water ('wetting out'). The membrane may be intact; a wash and fresh proofing solve it.
Can a worn membrane be repaired?+
Small damage and delamination can sometimes be fixed, but the membrane wears little with normal use – it is usually the DWR that needs renewing.
Can you wash and re-proof the jacket for me?+
Yes. We clean and re-proof according to the garment and its care label. You see the price before you order.
Ready to fix it?