At 350 euros, the Compressport Thunderstorm Waterproof 25/75 is the most expensive waterproof jacket on the mainstream market. Yet three independent French testers, after several months in a wide range of conditions, agree: it's hard to find a real technical flaw.
© Compressport, official photo used for editorial purposes
The Thunderstorm 25/75 posts record ratings for a mainstream trail jacket: 25,000 Schmerber of waterproofing and 75,000 g/m²/24h of breathability, delivered by a 3-layer Japanese membrane. Three independent field tests agree on flawless rain protection and breathability rated exceptional even at a hard pace, with only one real drawback: a price all of them found close to prohibitive. There's a notable discrepancy in the stated weight for size L (126 g, 132 g and 143 g across the three sources), a sign that field measurements vary from one tester to the next.
In late 2023, Compressport updated its top-of-the-range waterproof, breathable jacket: the Hurricane Waterproof 25/75 made way for the Thunderstorm Waterproof 25/75. The technical ratings are unchanged (25,000 Schmerber, 75,000 g/m²/24h), but the Swiss brand switched to a Japanese-made membrane and, according to the tests, shaved about 15 grams off the jacket. What drew the most attention was its 350-euro list price, which makes it the most expensive ultra-ready waterproof jacket on the mainstream market.
A price like that inevitably raises questions. But it found a consistent technical justification in the three independent field tests we consulted for this article: the jacket comes across as close to flawless on its two headline metrics, waterproofing and breathability.
| Brand | Compressport |
| Model | Thunderstorm Waterproof 25/75 |
| Waterproofing | 25,000 Schmerber |
| Breathability | 75,000 g/m²/24h (MVTR) |
| Membrane | 3 layers, Japanese-made, DWR water-repellent treatment |
| Weight (size L) | 126 g to 143 g depending on field measurements (see cross-checked reviews) |
| Storage | Packs into its own zipped chest pocket, compact size of about 18x13 cm |
| Worn over a pack | Yes, cut designed to go over a trail pack |
| Hood | Elastic edging, no manual adjuster on the tested models |
| Zip | Full-length backed center zip, zip guard |
| Reflective details | Chest logo, cuffs, back lettering |
| Official price | €350 (often found for €260 to €280 at some retailers) |
| Use | Running, trail, ultra, cycling |
© Compressport / i-Run, official photo used for editorial purposes
RunMorph tip: always pair the Thunderstorm with a base layer or arm sleeves in cold weather. Its thin membrane puts breathability ahead of heat retention.
Julian (Le Comparatif du Trail) tested it over several months, including in heavy, sustained rain, and found no moisture getting in anywhere: not at the back, the neck or the forearms. He points out two concrete limits. The hood has no brim, which bothers glasses wearers, and thermal protection falls short of an Asics Fujitrail or a Cimalp Storm Pro, since the jacket is much thinner and therefore less warm in severe cold. Another technical point: in his view, the cut is too snug to slip a pack, even a small one, under the jacket.
Jérémy (Journal du Trail) confirms the flawless waterproofing and a breathability that blew him away during hard sessions at 8-10°C in light rain, with the jacket drying much faster than his others. He gives it 4.25/5, with only one real complaint: the cuff openings are a little too narrow for easy access to a watch. On pack use, his take differs from Julian's. He wears the jacket over his trail pack without any problem, which matches the standard recommended use rather than the setup Julian tested (slipping a small pack under the jacket, an unconventional use).
Vincent (RunMag) agrees with the first two testers on the essentials and scores it 7/10: excellent waterproofing and breathability, good freedom of movement despite tight sleeves, and a hood whose adjustment could be better. He also confirms the jacket is designed to be worn over a trail pack, not the other way around. On weight in size L, the three sources report different figures: 126 g for Julian, 132 g for Jérémy, 143 g for Vincent. The gap most likely reflects different weighing methods rather than a real variation in the product, but we'd rather flag it than settle it arbitrarily.
| Criterion | Compressport Thunderstorm 25/75 | Salomon Bonatti Trail |
|---|---|---|
| Waterproofing | 25,000 Schmerber | 10,000 Schmerber (AdvancedSkin Dry) |
| Breathability | 75,000 g/m²/24h | 10,000 g/m²/24h |
| Weight | 126 to 143 g depending on measurement | Heavier, cut designed around a 12L pack |
| Price | €350 | About €160 |
| Positioning | Pure technical top end | All-round trail benchmark, best value for money |
The Bonatti Trail remains the all-round benchmark for the vast majority of trail runners, with far more accessible value for money. The Thunderstorm 25/75 targets a narrower audience: runners who want the best technical ratings on the mainstream market and are ready to pay more than double for them.
The Thunderstorm 25/75 is for trail and ultra runners who have already been let down by the breathability of a standard waterproof jacket during hard efforts in the rain, and who are ready to invest in the top tier so they no longer have to choose between protection and comfort. On a tighter budget, the Salomon Bonatti Trail or the Raidlight Top Extreme Ultra MP+ already cover most needs very well.
The right rain gear is no substitute for serious preparation: the RunMorph training plans help you structure your long runs, whatever the weather on the day.
Three independent testers, three different periods, one conclusion: the Thunderstorm 25/75 is hard to fault on the technical side. Its waterproofing and breathability deliver in the field, in conditions ranging from light drizzle to steady downpours, in training and on ultras alike. The only real sticking point is the price, which everyone found high, even testers who were otherwise won over.
8.5/10. One of the best technical waterproof jackets on the mainstream market, reserved for runners with the budget and the use (ultras, frequent long runs in the rain) to make it pay off.