Musto MPX GORE-TEX Pro Offshore Gear: A Research Note

This is a research note — a deep technical look at the product and what we would assess, before hands-on testing. We have not worn this gear ourselves, and we do not publish ratings or ownership claims until we have.

Musto's MPX 2.0 is a three-layer GORE-TEX Pro offshore system — jacket plus a choice of lower body — built on the most durable tier of GORE's Pro laminate family, engineered for prolonged, high-exposure time at sea rather than minimum weight. For the underlying membrane physics, see our guide to foul weather gear.

At a glance

Figures above are the maker's and GORE's published specifications, not our measurements. GORE publishes RET and hydrostatic-head values at the laminate level rather than per garment, so treat them as the laminate spec, not a Musto-tested garment figure.

The laminate, and why it behaves the way it does

Everything about this gear follows from the membrane. GORE-TEX Pro is built on expanded PTFE — a PTFE film stretched until it fractures into a node-and-fibril lattice roughly 0.01mm thick, with a pore structure sized in the sub-micron range. The pores are orders of magnitude smaller than a liquid water droplet, so bulk water cannot pass under normal sailing pressures, but they are far larger than a water-vapour molecule, so perspiration can diffuse outward down a vapour-pressure gradient. That is the whole trick: it seals against the sea while venting the crew. GORE publishes a hydrostatic head of 28,000mm for its laminates — well beyond the static pressure of any wave slap a crew will meet — and a RET (resistance to evaporative transfer) of under 6, which is the lower, better end of waterproof-breathable membranes and the reason Pro is specified for sustained-effort work rather than gentle cruising.

The "three-layer" designation is a construction, not a thickness. The ePTFE membrane is laminated between an outer face textile and an inner backer into a single composite that hangs like one fabric. Critically, there is no separate hanging drop-liner. On a boat that matters more than it sounds: a lined jacket has an inner layer that can wet through from spray running down the cuffs or neck, then sit cold and damp against a mid-layer for the rest of a watch. A bonded 3-layer construction has nothing loose to soak — water that beats the face DWR still meets the membrane, and the inside stays a dry, wickable surface. It also packs smaller and weighs less for the protection on offer, which is why offshore and mountain kit at this level is almost universally 3-layer.

GORE splits Pro into three product technologies, and MPX sits in the "Most Rugged" tier. That tier adds a polyurethane-reinforced membrane and is paired with tougher face textiles and the robust Micro Grid backer, trading a little raw vapour throughput for abrasion life and durable sealing — the correct bias for a garment that will be dragged across non-skid, ground under a harness, and worn wet for days. The lighter "Most Breathable" and stretch tiers exist for aerobic alpine use; a working sailor is better served by the ruggedness bias, and that is the deliberate choice Musto has made here.

What changed in the 2.0 generation

The current MPX is the 2.0 revision, and the changes are laminate-level rather than cosmetic. The face fabric is now 100% recycled polyamide 6.6 and the backer is a solution-dyed nylon tricot. Polyamide 6.6 (nylon 6.6) is the higher-melting, more abrasion- and tear-resistant nylon variant, which is the right face chemistry for a shell that lives against rigging and grp; the recycled feedstock is an environmental change, not a performance compromise, because the fibre spec is what matters. Solution dyeing — pigmenting the polymer in the melt rather than piece-dyeing finished cloth — is worth flagging: it uses far less water and gives markedly better colour- and UV-fastness, and a solution-dyed backer resists the grey, worn-through look that afflicts piece-dyed liners after a hard season in the sun and salt.

The headline number is weight. Musto quotes roughly a 250g reduction on the offshore jacket, about 15% versus the prior generation, achieved by moving to a lighter face-fabric class (a ~40-denier-grade recycled face rather than the heavier cloth of older MPX) while keeping the Pro laminate's sealing. Independent testing at Practical Boat Owner echoed the on-water effect rather than the gram count: the reviewer called it "impressively lightweight and comfortable, garment with plenty of freedom of movement," and reported it "still looks new, with no sign of wear" after 2,000+ miles including ten nights at sea, staying dry "even in thunderstorms and when bashing to windward with spray over the boat." That is genuinely useful third-party evidence — but it is a delivery-and-passage duty cycle, not repeated high-tempo inshore racing, and it is not our test.

Construction and hardware — what a professional actually inspects

The membrane is necessary but not sufficient; on a race boat the garment lives or dies on its seams, closures and wear panels.

• Seams. Every seam is taped/sealed. A 3-layer shell is only as waterproof as its least-sealed needle line, and the failure mode to watch over a career is tape lifting at high-flex points (underarm, crotch, hem) after repeated wet–dry cycling. Nothing to fault on paper; it's a durability question only time answers.
• Front closure. The jacket runs a full-length centre-front zip behind a double storm flap with hook-and-loop closure — the flap, not the zip, does the real sealing against wind-driven water. The offshore salopette uses a two-way YKK centre-front zip so the wearer can vent or relieve without dropping the braces, plus an internal self-fabric zipper gusset behind it to block ingress at the one seam most exposed to bilge water and spray pooling in the lap.
• Hood and collar. A pre-shaped, fully adjustable "spume" visor with vertical and horizontal adjustment, and a high storm collar; the hood stows into a high-visibility stowage pod sized to sit clear of a lifejacket, and grid-fleece lines the collar and crown for warmth against the neck. This is the area MPX deliberately keeps lighter than HPX — adequate for offshore work, not the survival-grade collar architecture of the flagship.
• Cuffs, hem and pockets. Adjustable cuffs; a rubberised, shock-cord hem draw for a wind seal; fleece-lined handwarmer pockets on the jacket. The offshore lower body carries large bellows cargo pockets, YKK zipped thigh pockets with laser-cut drainage so water sheds instead of pooling, and a multi-tool facility.
• Braces. The over-shoulder braces are fully adjustable via hook-and-loop rather than plastic ladderlock buckles — a small but real detail, because it removes the hard buckle that otherwise digs in under a lifejacket and harness, and it fine-tunes cleanly over varying mid-layer bulk.
• Reinforcement. CORDURA at the seat, knees and hem — the abrasion zones for anyone kneeling on non-skid or sitting on a rail — plus a four-way-stretch, abrasion-resistant CORDURA back and shoulder panel with its own durable DWR. That stretch panel is the clever part: it puts the toughest cloth exactly where a crew loads the garment (grinding, hiking, reaching) while letting it move, rather than forcing the choice between armour and mobility.
• Visibility. Enlarged photoluminescent reflectors — charged by daylight, glowing at night — to aid a man-overboard sighting without relying solely on retroreflective tape and a torch.

DWR, salt and the care regime

Two points a professional should internalise. First, the DWR is now a PFAS-free (fluorocarbon-free) durable water repellent, and fluorocarbon-free finishes wet out sooner and need more frequent reactivation than the old C8 chemistries — when the face stops beading, the membrane is still waterproof but breathability drops as the saturated face fabric blocks vapour transfer. It restores with a warm wash and low-heat tumble, and re-treats with a wash-in or spray product. Second, GORE is explicit that salt water does not clog or degrade the ePTFE membrane — but salt is hygroscopic, so dried salt on the face fabric pulls in moisture, kills the beading and makes a jacket feel like it has failed when it has only gone thirsty. A periodic freshwater rinse is not optional maintenance for coastal and offshore use; it is the difference between a jacket that breathes and one that doesn't. That care sensitivity is the honest cost of a high-performance laminate.

Where it fits a Melges 40 campaign

A Melges 40 Grand Prix programme is inshore, dry-suited-crew, high-tempo racing, and by that yardstick the full-coverage MPX offshore jacket and offshore salopettes are more garment than a warm race day needs — the same reasoning we set out in our note on race sailing jackets. The place this system earns its keep is at the edges of a campaign: deliveries between regattas, early- and late-season racing in cold, wet fronts, and any genuinely offshore leg, where sustained sealing and durability beat the last few grams. If a crew were choosing within the MPX line for the racecourse itself, the MPX Race salopette is the more coherent pick — same GORE-TEX Pro, but trimmed close, low-bulk pockets and the stretch back panel — while the offshore pieces belong in the delivery bag. MPX sits squarely in the conversation as a well-established, durable option, which is why we cover it here and in our Sail Racing vs Zhik vs Musto comparison.

Honest read versus the alternatives

Against Musto's own HPX, MPX is the lighter, more mobile, more affordable choice: HPX uses GORE-TEX Pro with the Ocean Technology membrane and Micro Grid backer in heavier deniers, with a bigger storm collar, deeper fleece and harder-sealing cuffs and zips for survival-grade ocean racing. HPX resists foredeck abuse better and keeps more water out in extremis; MPX inherits those developments a generation later at less bulk. For inshore and coastal Grand Prix work, HPX is usually more garment than the job calls for.

Against premium race shells from brands such as Zhik or Sail Racing, the argument is about laminate philosophy. Those brands compete hard on lightweight, high-mobility constructions and their own or GORE membranes; MPX's case rests on GORE-TEX Pro's "Most Rugged" durability, its documented offshore pedigree, and a shell that is reproofable and repairable rather than disposable. Where MPX can lose ground is exactly there: at the very top of the aerobic-effort, warm-weather envelope, a lighter or more breathable laminate may vent a hard-working crew better and feel less like protection you're wearing in conditions that don't demand it. The trade-off is coherent — buy MPX for durability and sustained wet-weather sealing, buy lighter for maximum mobility in milder racing.

What we would assess

Before drawing any conclusion — and with no rating until we have used it — we would test:

• Sustained dryness under continuous windward spray and driving rain across a full day, focusing on the cuff, hem and lap ingress paths rather than the field of the fabric.
• Breathability under racing load — whether the "Most Rugged" laminate vents a hard-hiking, grinding crew or condenses inside, and how quickly the PFAS-free DWR wets out in salt spray.
• Hood and collar in a blow — field of vision, and whether the hood genuinely stows clear of a lifejacket as designed.
• The stretch CORDURA panel and brace system — mobility grinding and hiking, and whether the hook-and-loop braces hold trim under a harness.
• Seam and tape integrity across a season of wet–dry cycling, plus zip and DWR behaviour after repeated freshwater rinsing.
• Warmth-to-weight across cold fronts and mild days, and how the fuller offshore cut layers over a mid-layer under a lifejacket.

The takeaway

MPX 2.0 is a serious, well-evidenced 3-layer GORE-TEX Pro system built on the durable end of GORE's Pro family: recycled polyamide 6.6 face, solution-dyed Micro Grid–type backer, RET <6 and 28,000mm hydrostatic head at the laminate level, seam-sealed, with intelligent CORDURA reinforcement and thoughtful hardware. Its bias is durability and sustained sealing over minimum weight, which makes its natural home in a Melges 40 campaign the delivery legs and cold, wet racing rather than a warm inshore day — where the Race salopette, or a lighter shell, is the sharper tool. We would want to wear it hard across that full range before saying anything more, and until we have, this remains a research note, not a verdict. See also our comparison of Sail Racing, Zhik and Musto jackets.