The Toll Road Has Open Lanes
For decades, Gore-Tex functioned less like a fabric technology and more like a toll road. Brands wanting a credible waterproof-breathable shell paid the licensing fee and entered Gore’s quality assurance program. Brands that didn’t paid in consumer skepticism. That structure held because Gore held the core patents on expanded polytetrafluoroethylene (ePTFE) membranes. Its ePTFE fabric patents expired in the late 1990s. The toll road still exists, but the lanes around it are open.
The largest recent change came from Gore itself. It has been moving its consumer line from ePTFE to expanded polyethylene (ePE), a membrane it sells as PFAS-free. This piece maps that shift alongside two long-running alternatives, Pertex Shield and Toray Dermizax, using manufacturer pages and named independent reviews.
What a Waterproof-Breathable Membrane Does
A membrane sits between the face fabric and lining of a shell garment. Its job is a controlled contradiction: block liquid water from entering while allowing water vapor to escape outward.
The mechanism differs by type. ePTFE works through microporous structure — the material is stretched until it develops billions of tiny pores, each small enough to block liquid droplets but large enough to pass vapor molecules. Hydrophilic membranes have no pores. They absorb vapor on the interior surface and pass it through the polymer matrix via chemical attraction. A newer approach spins the membrane from nanofibres into an open web that also lets some air through.
Performance is usually reported as hydrostatic head (waterproofing, in millimeters of water column) and MVTR (moisture vapor transmission rate, in grams of water vapor per square meter per 24 hours). Higher is better on both axes. The two properties are frequently in tension. Test methods vary and makers often do not name theirs, so figures from different sources cannot be compared directly.
Gore-Tex: The Reference Point
Gore-Tex Pro, the tier Gore markets for extreme conditions, was built on ePTFE for most of its life. Next-generation Pro uses an ePE membrane in three layers: a tough outer fabric with a PFAS-free durable water repellent (DWR), the membrane, and a solution-dyed MICRO-GRID nylon backer. Gore tested it on a moving mannequin in a rain room at 22 inches (55 cm) of water per hour. It publishes no hydrostatic-head or MVTR figures for Pro.
In OutdoorGearLab’s hardshell review (updated June 26, 2026), the four Gore-Tex Pro jackets weigh 454 to 516 g and list at $650 to $900, on 40D to 100D main face fabrics. The lightest and least expensive is the Arc’teryx Beta AR in 3L Gore-Tex Pro ePE.
Gore’s quality program is real. It tests GORE-TEX products to its own protocols and backs them with its GUARANTEED TO KEEP YOU DRY promise. The licensing cost is embedded in the price.
One Gore construction has left the field. In 2022 Gore Fabrics stopped offering Shakedry, its membrane-on-the-outside fabric, citing ongoing supply challenges (Cyclingnews, 2022). GOREWEAR, the in-house brand that stockpiled it, has since closed.
Sources: GORE-TEX Pro products; OutdoorGearLab, Best Hardshell Jackets; Cyclingnews on Shakedry; GOREWEAR closure notice
Pertex Shield: Weight as the Argument
Pertex grew out of a Lancashire weaving mill, has made outdoor fabrics since 1979, and is owned by Mitsui & Co. Its base Shield fabric pairs a woven face fabric with a nonporous or microporous membrane in 2, 2.5 or 3 layers. Shield Pro uses an engineered microporous membrane built for durability. Shield Air is an electrospun nanofibre web with open pores, which makes it air permeable. Revolve fabrics add a mono-material recycled-polyester option.
Pertex publishes no hydrostatic-head or MVTR figures for these fabrics. It says standard MVTR tests “do not capture Pertex Shield Air’s full in-use comfort benefit”, because warm, moist air also leaves by convection. Rab lists 20,000 mm and 20,000 g/m²/24h on its Shield jackets without naming a test method.
What Shield delivers that Gore-Tex Pro does not: very low weight. Rab’s Phantom, in 7D 2.5-layer Shield (51 g/m²), weighs 116.5 g in size M. Yamatomichi’s 2026 UL All-weather Jacket, which pairs Shield Air with Shield Pro, weighs 184 g in size M. That matters for ultralight backpacking or fast-and-light alpine objectives where the weight-to-risk ratio is actively managed.
Durability is the trade-off. A 7D face fabric abrades more quickly than the 40D to 100D faces on Gore-Tex Pro shells. Yamatomichi adds that after years of field testing, Shield Air became more likely to wet out in heavy rain as its DWR wore off, so its 2026 jacket places Shield Pro where rain hits hardest. For scrambling with a pack or technical climbing, the weight savings carry a real durability cost. For trail running or ski touring — where abrasion contact is minimal — that calculus shifts.
Pertex Shield garments sit below Gore-Tex Pro on price. Rab’s US Shield jackets include the $140 Downpour, the $225 Phantom and the $280 Firewall Alpine.
Sources: Pertex Shield; Pertex Shield Air; Rab Phantom; Yamatomichi UL All-weather Jacket
Dermizax: The Hydrophilic Case
Toray Industries launched Dermizax in 1995 as a nonporous, hydrophilic polyurethane laminate. Toray says hydrophilic molecules in the film carry moisture to the outside. Dermizax NX, launched in 2011, is Toray’s premium line for extreme activities.
The name now covers several membrane types. Toray’s range also includes microporous, plant-based, polyester-film and electrospun-nanofibre versions, so a Dermizax label alone no longer says how the membrane breathes.
Toray rates Dermizax, EV and NX at 20,000 mm or higher on the JIS L 1092 B high-pressure method. Its brand site shows NX as the most vapor-permeable of the three but publishes no MVTR number.
The classic argument for a nonporous film is contamination. Sweat and body oils can clog the pores of a microporous membrane. A solid film has no pores to clog (Field Mag, 2026).
Dermizax garments are on sale in North America from mainstream brands. Outdoor Research’s Helium UL rain jacket, in 2.75-layer Dermizax on a 15D nylon ripstop face, weighs 162 g and lists at $225. Ortovox’s Westalpen 3L Jacket, in Dermizax NX, weighs 518 g and lists at $640. The Ortovox 3L Ortler, also in Dermizax NX, was the only Dermizax shell among the 12 in OutdoorGearLab’s 2026 hardshell review, at $550 and 445 g. OutdoorGearLab rated it stretchier and more breathable than Gore-Tex but less weather-resistant. Ortovox has since moved the Ortler to Gore-Tex with an ePE membrane.
Sources: Toray Dermizax history; What is Dermizax; Toray sports fabrics: Dermizax; Field Mag on Dermizax; Outdoor Research Helium UL Jacket; Ortovox Westalpen 3L Jacket; Ortovox Ortler GORE-TEX Jacket
ePE: The Chemistry Shift
Gore-Tex ePE reached the market in fall 2022 in a limited launch with brands including Patagonia, Adidas Terrex, Arc’teryx, Dakine and Salomon. Gear Patrol reported in 2023 that Gore planned to bring it to the broader outdoor market by 2025. Gore now calls ePE “the heart of next generation GORE-TEX Products”.
The chemistry matters. PTFE is a fluoropolymer and falls within the broad per- and polyfluoroalkyl substances (PFAS) class — synthetic chemicals facing increasing regulatory pressure in the EU and several US states due to environmental persistence. Polyethylene contains no fluorine. Gore describes next-gen GORE-TEX as a “PFAS-free laminate including its durable water repellent (DWR) treatment”, meaning made without intentionally added PFAS.
DWR, once the unresolved half of the problem, has moved too. PFAS-free finishes now ship on Gore’s next-gen laminates, Rab’s Shield jackets, eVent alpineST and Polartec Power Shield Pro. The cost is upkeep. UKClimbing noted in 2023 that ePE jackets need washing and reproofing more often, because PFAS-free DWR wears off sooner than the C6 finishes it replaced. The shift is not complete. Yamatomichi’s 2026 Shield jacket still uses a C6 DWR.
Gore publishes no hydrostatic-head or MVTR numbers for ePE. It describes the membrane as “light and thin, yet strong”. OutdoorGearLab’s 2026 reviews cover the Arc’teryx Beta SL in 3-layer ePE Gore-Tex ($500), the Outdoor Research Headwall in 3L Gore-Tex ePE ($540) and the Beta AR in Pro ePE ($650), so pricing now follows Gore’s tiers rather than the membrane. OutdoorGearLab notes that the thinner membrane let Arc’teryx use a more robust face fabric on the Beta SL.
Sources: Gear Patrol, 2023; Next-gen GORE-TEX products; GORE-TEX science-led innovation; UKClimbing, 2023; OutdoorGearLab, Best Rain Jackets; eVent alpineST; Polartec Power Shield Pro
Trade-Offs by Use Case
The membrane market is no longer a single hierarchy, and the field is wider than these three. OutdoorGearLab’s 2026 hardshell test also covers brand-owned membranes such as Mammut DRY Expedition, The North Face FUTURELIGHT and Patagonia H2No.
Fast and light — trail running, ski touring, fast-and-light alpine: Pertex Shield leads on weight, and Shield Air adds air permeability for high output. Dermizax competes through the Helium UL. The durability trade-off is acceptable when abrasion contact is low.
Technical mountaineering and alpine mixed terrain: Gore-Tex Pro, now on ePE, remains the reference where face fabric durability matters. OutdoorGearLab calls Gore-Tex Pro shells the most protective hardshells on the market. Pertex’s hard-use answer is Shield Pro. On a budget, OutdoorGearLab found the $389 Mammut Taiss HS, in DRY Expedition, almost on par with the premium-priced jackets.
Daily carry and urban-to-trail crossover: Dermizax offers stretch and strong breathability, though OutdoorGearLab found the 3L Ortler less weather-resistant than Gore-Tex.
Environmental compliance priority: Gore’s ePE laminates are sold as PFAS-free including the DWR, as are eVent alpineST and Polartec Power Shield Pro. For other jackets the garment label matters more than the membrane name, since either the finish or the membrane film can carry PFAS.
Verdict
Gore-Tex remains technically credible. The licensing apparatus that made it the default choice no longer holds the same exclusionary power, and Gore’s own answer to PFAS pressure was to move away from ePTFE.
Pertex Shield, Dermizax, and ePE each offer legitimate performance profiles with honest trade-offs on weight, durability, breathability, price, and sourcing. The choice is not between Gore-Tex and an inferior alternative. It is between different performance priorities. Identify the actual use demands — output level, terrain, abrasion exposure, regulatory requirements — and the field narrows quickly.