Dermizax vs Gore-Tex Pro: Where the Laminate Matters
Gore-Tex Pro is the most rugged tier of Gore’s waterproof-breathable range, and the two top-ranked jackets in OutdoorGearLab’s 2026 hardshell ranking both use it. Dermizax is Toray Industries’ waterproof-breathable fabric line; Toray’s partner showcase includes Ortovox, KJUS, Schöffel, Descente and KUIU. Both have changed since the usual rules of thumb were written: Pro now uses an ePE membrane, and Dermizax has grown into a family of membranes with different structures. The choice between them is not as simple as “which is better.” It depends on what you are actually asking the membrane to do.
This explainer covers the fundamental chemistry, works through the five trade-offs that matter most, and closes with a use-case summary grounded in what each laminate is genuinely optimized for.
What These Fabrics Actually Are
Gore-Tex membranes start as a polymer that is expanded, or stretched, until it forms a microporous structure. The pores let water vapor out but are far smaller than a water droplet, so liquid water cannot get in. For most of the brand’s history that polymer was PTFE, the base polymer of Teflon. Gore introduced an expanded polyethylene (ePE) membrane, built on the same principle, in 2022, and announced a next-generation Gore-Tex Pro fabric using it in September 2025. Gore says ePE is made without intentionally added PFAS. In most Gore-Tex products the membrane is bi-component: the expanded ePE or ePTFE combined with polyurethane (PU). Earlier Pro garments use ePTFE under the same name, so check the spec line for “ePE”.
Dermizax took the other route. Toray launched it in 1995 as a hydrophilic PU laminate: a solid film with no pores. Hydrophilic molecules in the membrane carry moisture to the outside: vapor dissolves into the inner face, diffuses through the polymer and leaves from the outer face. Toray added EV in 2001, pitched at hiking and climbing, and NX in 2011 as a premium line for limited customers. Both are still in its range, and Ortovox describes the NX in its jackets as a non-porous PU membrane. Toray added microporous and bio-based versions in 2020 and a high-durability microporous version in 2021, and the range now also lists polyester and electrospun nanofibre grades. A Dermizax label alone no longer guarantees a non-porous film.
The distinction between a porous scaffold and a solid hydrophilic film is less clean than it looks, because Gore’s membrane also contains PU, but it still shapes how each laminate handles moisture.
Breathability
This is the trade-off that generates the most confusion, partly because breathability numbers are rarely comparable across brands.
Cup tests report a moisture vapor transmission rate (MVTR) in g/m²/24h. JIS L 1099 alone includes a calcium chloride method (A-1), meant to approximate wear conditions, and a potassium acetate method (B-1) that measures a fabric’s maximum vapor transmission and usually returns much higher figures. The sweating guarded hotplate in ISO 11092 measures something else: resistance to evaporative heat transfer (RET), where a lower number means a more breathable fabric. Always check which standard was used before comparing figures.
Neither maker publishes an MVTR or RET figure on its current product pages. Gore says it tests breathability to ISO standards, with comfort simulations and wear trials. Toray ranks its grades against each other and says breathability can be tuned to each partner’s specification. Ortovox lists “up to 28,000 g/m²/24h” for its Dermizax NX jackets without naming a test method.
The physics still matters. A hydrophilic film transmits vapor faster as it takes up moisture, so it works best once humidity has built up inside the jacket. Phillip Gibson found that in a hydrophilic polymer layer, temperature matters much less than humidity, and that most of the change in vapor flux at different temperatures comes from the vapor pressure of water itself (Polymer Testing, 2000). That undercuts the “cold” half of the old rule that microporous Gore-Tex Pro breathes more consistently in cold, dry air than a solid-film membrane. The “dry” half has a real basis in the film’s humidity dependence, though a hard-working wearer raises the humidity inside the shell.
Field results do not settle it either. OutdoorGearLab described the fabric of the one Dermizax shell in its 2026 ranking, the Ortovox 3L Ortler in Dermizax NX, as “more breathable than Gore-Tex” and suited to high-output ski touring in dry weather. It scored 8.0 for venting and breathability, a metric that also counts pit zips, against 7.1 for the Arc’teryx Beta AR in Gore-Tex Pro ePE; the Norrøna Falketind in standard Gore-Tex matched it. That is one jacket in one review, not a verdict on either laminate.
Waterproofness and Weather Resistance
Both laminates exceed any reasonable threshold for waterproof performance. Toray rates Dermizax at 20,000 mm or higher. Gore says its laminates consistently meet its standard of over 28,000 mm water column, and for next-generation Pro it adds a rain-room test in which a moving mannequin takes 22 inches (55 cm) of water per hour from all angles.
For most users the gap between 20,000 mm and 28,000 mm is not meaningful. Neither laminate will wet through under realistic field conditions if the DWR on the face fabric is maintained. In its 2024 review, OutdoorGearLab found the Ortler’s Dermizax NX “every bit as waterproof and windproof as advertised”, yet the jacket scored 6.0 for weather protection, the lowest in the 2026 ranking. The reviewers’ main weather complaint was a DWR that seemed to wear off quickly.
DWR (durable water repellency) degradation is worth addressing separately. When the face fabric of any laminate wets out, water clings to the outer layer. This does not breach the membrane, but it adds weight and reduces apparent breathability because saturated fabric impedes vapor transmission. Gore’s next-generation products use a PFAS-free DWR, and Toray now offers PFAS-free Dermizax variations. Wash-in or spray-on DWR treatments restore function; this is not a defect unique to either membrane type.
Durability and Longevity
Gore puts Pro’s durability in the textiles around the membrane. Next-generation Pro is a three-layer construction: a tough outer fabric with a PFAS-free DWR, the ePE membrane, and a solution-dyed MICRO-GRID nylon backer. In Gore’s words, “both the inner and outer fabrics are engineered to resist snags and abrasion.” Gore pitches the tier at athletes and professionals in extreme environments. Face fabrics still vary: the Pro shells in OutdoorGearLab’s ranking run from 40-denier faces with heavier reinforcements to the 100-denier Arc’teryx Alpha SV.
Toray tailors face fabric, stretch, durability, handfeel and even how quiet the fabric is to each partner, so Dermizax durability depends heavily on the garment. A hydrophilic film has no pores to clog, which is one form of durability. But polyurethane can break down through hydrolysis with long exposure to heat and moisture, a known aging mode for PU-based laminates. That is not unique to Dermizax, since Gore’s bi-component membranes also contain PU, and Toray markets its 2021 high-durability version on “durability against deterioration.” OutdoorGearLab listed limited durability and a fabric that seemed to get dirty quickly among the Ortler’s drawbacks. Neither maker publishes long-term comparative aging data under standardized conditions.
Weight and Packability
The old rule that Dermizax shells are lighter does not hold up in current data. Face fabric, backer, reinforcements and features appear to matter more than the membrane.
In OutdoorGearLab’s 2026 ranking, the four Gore-Tex Pro shells weighed between 454 g (Arc’teryx Beta AR, Gore-Tex Pro ePE, men’s medium) and 516 g (Arc’teryx Alpha SV, 100-denier face). The Ortovox 3L Ortler in Dermizax NX weighed 445 g, 9 g less than the Beta AR, and the reviewers found it exceptionally packable for a backcountry ski jacket. A standard Gore-Tex shell in the same ranking, the Norrøna Falketind Gore-Tex, came in at 400 g, lighter than both. Ortovox has since moved the Ortler jacket to Gore-Tex and no longer lists the men’s 3L Ortler: the new Ortler Gore-Tex Jacket, in standard Gore-Tex with an ePE membrane, is listed at 335 g, while Ortovox’s Dermizax NX Westalpen 3L Jacket is listed at 518 g.
For ultralight-focused users, the membrane brand is a poor proxy for weight; compare face fabric denier and garment weight instead. For alpinists prioritizing durability in a single heavy-use shell, a few dozen grams rarely decide it.
Price
Gore-Tex Pro sits at the premium tier: the Pro shells in OutdoorGearLab’s 2026 ranking list at $650 to $900. Dermizax spans a wider range. Outdoor Research’s Helium UL rain jacket, in 2.75-layer Dermizax, lists at $225. The Dermizax NX Ortler was listed at $550 in OutdoorGearLab’s ranking, close to a standard Gore-Tex ePE shell there, the Outdoor Research Headwall, at $540. On Ortovox’s US site, the Dermizax NX Westalpen 3L Jacket is $640 and the Ortler Gore-Tex Jacket, in standard Gore-Tex rather than Pro, is $660, so within one brand Dermizax NX and standard Gore-Tex sit at almost the same price.
The gap between a Dermizax hardshell and a Pro shell is real but not dramatic. Gore-Tex Pro is not a budget purchase, and a Dermizax hardshell costs about as much as a standard Gore-Tex one. Either is a long-term investment in a technical piece expected to last multiple seasons with proper care.
Where the Laminate Actually Matters
The laminate choice has real consequences in three scenarios.
First, long days in heavy, wet weather. Gore-Tex Pro’s rain-room testing, abrasion-resistant textiles and Guaranteed To Keep You Dry promise are its strongest arguments. OutdoorGearLab calls the Gore-Tex Pro shells in its 2026 ranking “the most protective hardshells on the market.”
Second, heavy abrasion and hard daily use. For guides, ski patrollers, and climbers who treat a shell as a tool rather than a garment, Gore-Tex Pro’s durability backing and construction philosophy are appropriate.
Third, high-output movement where stretch and comfort decide whether the shell stays on. Toray builds Dermizax around soft handfeel and stretch, and OutdoorGearLab endorsed the Ortler for dedicated backcountry skiers on the strength of its stretchy fabric and breathability. For ski tourers and fast-moving mountain users who wear a shell while working hard, a Dermizax shell is a logical choice.
Where the Laminate Doesn’t Much Matter
For casual hiking in temperate climates, car camping, urban use in rain, or any activity where sustained aerobic output inside the shell is limited, the performance differences between these two membranes will not be perceptible. Either one will keep rain out. Either one will breathe adequately when the wearer stops moving. Spending to reach Gore-Tex Pro tier for low-intensity use is not justified on technical grounds.
Summary
Dermizax and Gore-Tex Pro are different engineering answers to the same problem. Classic Dermizax moves vapor through a solid hydrophilic PU film: no pores to clog, a soft and stretchy feel, breathability that rises as humidity builds, and a widening family of other structures under the same name. Gore-Tex Pro now pairs a microporous ePE membrane with abrasion-resistant face and backer fabrics: Gore’s most rugged laminate, the most protective shells in OutdoorGearLab’s 2026 ranking, and a long track record in hard mountaineering use, most of it earned by the ePTFE generation.
The honest answer to “which is better” is that neither is universally superior. The laminate should match the use case. For sustained bad weather and hard use with a single durable shell: Gore-Tex Pro. For stretch-first, high-output layering: Dermizax is the more logical choice.
Everything else is marketing.
Primary sources: Gore-Tex Pro; Gore-Tex membrane; Gore, ePE products; Gore, next-gen Pro announcement (2025); Toray, What is Dermizax; Toray, Dermizax history; Toray, Dermizax products; Toray, Dermizax versions; Ortovox Westalpen 3L Jacket; Ortovox Ortler Gore-Tex Jacket; Outdoor Research Helium UL Jacket. Independent sources: OutdoorGearLab, best hardshell jackets (2026); OutdoorGearLab, Ortovox 3L Ortler review (2024); GearJunkie, ePE (2021); Boken, JIS L 1099 methods (Japanese); Gibson, Polymer Testing (2000). All checked October 2026. Affiliate disclosure: Treeline Index does not currently carry affiliate links for products mentioned in this explainer.