Each answer stands on its own. Industry figures are cited where used; anything describing our own production is either a verified capability or marked as pending test data.
Why does a waterproof jacket "wet out" in rain — has the membrane failed?
In most cases the membrane has not failed. What failed is the DWR on the outer face fabric, and the symptom is comfort, not leakage.
The outer face fabric is treated with a durable water repellent (DWR) that lowers its surface energy so rain beads and rolls off. DWR is a consumable finish: abrasion, body oils, dirt and UV wear it down. Once it is depleted, the face fabric absorbs water instead of shedding it, and a continuous film of water forms across the outside of the garment.
That water film is the problem. The membrane moves vapour by diffusion, driven by the humidity difference between the inside and the outside of the jacket. A saturated face fabric closes off that path — the vapour has nowhere to go, so it condenses on the inside of the membrane. The wearer feels cold, clammy fabric against them and concludes the jacket is leaking. Gore's own technical documentation is explicit that this wet-out condition is a face-fabric phenomenon, not a membrane failure.
Customer service consequence. A large share of "it leaks" tickets on shell jackets are wet-out. Test them apart: if water beads on the outside and the inside is dry, the DWR is fine. If the face fabric is dark and saturated while the inside is damp with no water running through, it is wet-out, and the fix is cleaning and reactivating the DWR. If water actually passes through a seam or a specific point, that is a genuine defect and should come back to the factory.
Product spec consequence. Because DWR decay is what the end user meets first, DWR durability deserves as much attention in your spec as hydrostatic head. Ask for the DWR chemistry, whether it is fluorine-free, and the wash-cycle count it is rated to.
Write into your care label: wash and reactivate the DWR when water stops beading — not once a year on a schedule.
What is the difference between fluorine-free and fluorinated DWR, and why does fluorine-free need more maintenance?
Fluorine-free (PFAS-free, C0) DWR performs comparably against plain water but has weaker oil and stain resistance and a shorter service interval, so it needs reactivating more often. The trade is regulatory and environmental, and it is no longer optional in most markets.
Fluorinated chemistries — the C8 and later C6 finishes — worked by presenting fluorine atoms at the fabric surface, giving very low surface energy. That repelled water and oils, and it lasted. It also belongs to the PFAS family: persistent, mobile, and now restricted or being restricted across the EU and multiple US states. The industry response has been a move to fluorine-free finishes (silicone, hydrocarbon and dendrimer chemistries) and, at the membrane layer, a move from ePTFE to ePE. GORE-TEX began its fluorine-free transition around 2022 and states in its 2023 ePE white paper that the new membrane holds waterproofness and breathability within a small margin of the ePTFE generation it replaces.
What changes for the end user is the outside of the garment, not the membrane. A fluorine-free DWR repels water well when fresh, does not repel oils and body grease so it picks up contamination faster, and loses its bead earlier in the garment's life and after fewer washes. That is not a defect — it is what current chemistry does, and every brand shipping PFAS-free product is in the same position.
Consequences for a brand. Raise cleaning and reactivation from an obscure care note to a visible instruction, and train customer service to recognise wet-out (see the previous answer). If your program sells into workwear, catering, or any oil-exposed environment, flag it at spec stage — that end use is where fluorine-free finishes are hit hardest.
What we hold: PFAS-free DWR is available from our mill and is our default. The specific finish, its chemistry and its wash-durability rating are named on the spec sheet for your order. [Wash-cycle durability figure: TEST REPORT PENDING — we do not quote a number we have not tested.]
What actually separates a fully seam-sealed jacket from an ordinary rain jacket?
The needle holes. A waterproof fabric sewn without sealed seams leaks at every stitch line, which is why full seam sealing — not the fabric rating — is the line between a waterproof garment and a rain-resistant one.
Every seam puts a row of needle holes through the membrane. The membrane's waterproofness is continuous; the sewing breaks it. Sealing restores it: a waterproof tape is laid over the seam allowance on the inside and bonded with heat and pressure so the tape flows into and closes the perforations.
Fully taped (fully seam-sealed) means every seam in the garment is taped. This is the standard on technical shells. Alpine specs go further with wider tape on primary seams and reinforcement at high-abrasion points — Mountain Equipment publishes 22mm tape on primary seams with double-taping at shoulder and cuff for its alpine range. Critically taped means only the seams most exposed to water are taped, typically shoulders, hood and upper chest: cheaper, lighter, and adequate for short-exposure use. Untaped is a water-resistant garment, whatever the fabric label claims.
Taping is a real manufacturing capability, not a finishing detail. It needs a taping machine, correct temperature and pressure for the specific laminate, an operator who can hold a consistent path around curves and seam intersections, and a QC step. Bad taping is the most common route to a warranty return on a shell, and it does not always show at first inspection — it shows after a season of flexing and washing.
Write into your tech pack: state fully taped or critically taped explicitly, and for critically taped, name the seams. Ask your supplier whether taping is in house or subcontracted, and ask to see the taped seams on the sample from the inside.
What we hold: 5 seam-taping machines and 3 waterproof-zipper machines on site. Taping is done in house on every order.
How should a shell be laundered so the seam tape does not lift?
Cool wash, gentle cycle, low spin, liquid detergent only — no fabric softener, no bleach, no powder — and run an empty rinse cycle first to clear detergent residue from the machine. Most tape failures traced back to laundering come from heat and mechanical stress, not from washing as such.
1. Prepare. Empty pockets, close all zips and hook-and-loop closures. Run the machine empty on a rinse cycle first to clear softener and detergent residue from a previous load — residue redeposits on the face fabric and blocks it.
2. Detergent. Non-biological liquid detergent, mild soap, or a technical-garment wash. Never fabric softener, bleach or disinfectant: they leave a hydrophilic film that defeats the DWR and can attack the finish.
3. Cycle. Gentle cycle, water at 30°C, spin at or below 400 rpm. High-speed spinning is the specific risk to seam tape — the mechanical load at the tape edge is where lifting starts.
4. Dry. Hang to dry in a ventilated, shaded place. Avoid direct sun.
5. Reactivate the DWR. Once fully dry, tumble on low for 20–30 minutes; or, with no dryer, press through a clean dry cloth on a medium iron setting. Heat migrates the DWR back to the fibre surface and restores the bead.
When heat alone no longer restores beading, the DWR is spent and needs replacing — a wash-in product added at the softener drawer during a wash for whole-garment coverage, or a spray-on product for local reproofing at shoulders and cuffs where a pack strap has worn it.
Write into your care label, in this order: 30°C gentle, spin ≤400 rpm, liquid detergent, no softener or bleach, hang dry, tumble low to reactivate. Care labels that say only "machine wash cold" are the reason end users spin their shells at 1,200 rpm and then report tape lifting as a manufacturing fault.
