Best trail and ultra trail jacket: comparison and reviews

Nothing ruins an ultra run more than a freezing rain shower soaking through unsuitable clothing, leaving you cold and miserable in the middle of a climb. Finding the best trail jacket is your insurance against these difficult conditions, so look for a model that is both windproof and truly waterproof. Our analysis highlights the equipment that will keep you dry while wicking away perspiration, so that the weather is never an excuse again.

1. Summary of the rankings
2. The criteria that make the difference for your trail jacket
3. Waterproofing: understanding the Schmerber index
4. Breathability: the RET index, your best ally against the sauna effect
5. Beyond the numbers: the details that really matter
6. Compressport Thunderstorm Waterproof: the breathable fortress
7. Salomon Bonatti WP: the timeless classic
8. Raidlight Top Extreme MP+: French versatility
9. Scott RC Run WP: the featherweight of race days
10. The verdict: how to choose the right jacket for your sport?

Summary of the rankings

Finding the perfect equipment is often a real challenge. Here, no nonsense, I'll guide you to the best trail jacket, the one that will make the difference. This ranking is based on rigorous testing in real-world conditions, in rain and wind.

The Compressport Thunderstorm dominates the competition in terms of pure performance. It's like a protective second skin. Its waterproofing and breathability ratio reaches new heights rarely equalled, justifying its elite status.

The Salomon Bonatti remains the great classic., the safe bet that always reassures. Raidlight offers a clever alternative, while Scott will appeal to born competitors seeking lightness above all else.

But the devil is in the details. The rest will reveal exactly what that means. which model is worth your investment.

The criteria that make the difference for your trail jacket

Before moving on to the models, we need to speak the same language. Understanding the figures and technical terms is the only way to not to be taken in.

Waterproofing: understanding the Schmerber index

Waterproofing cannot be guessed at; it is measured in Schmerber. This technical term simply refers to the resistance of a fabric to water pressure. Imagine a column of water placed on the fabric: the height supported before infiltration defines this score. It is the deciding factor in the laboratory.

Below 10,000 Schmerber, forget about serious protection; we're just talking about water repellency. To tackle the mountains, this The threshold of 10,000 is the minimum required.. Most ultra-trail regulations impose this basic standard.

Of course, aiming for 20,000 or more guarantees protection against storms. But be careful, a total protection often hinders heat dissipation. It is one of the mistakes to avoid when switching from marathon running to trail running to neglect this equipment.

Breathability: the RET index, your best ally against the sauna effect

Breathability refers to your jacket's ability to expel perspiration to the outside. To avoid ending up soaked, rely on the’RET index, or Thermal Evaporative Resistance. This is the only reliable measure for anticipating thermal comfort.

Here, the logic is reversed: the lower the number, the more breathable the fabric is. A RET below 6 is ideal for intense exercise where your heart rate rises rapidly. Between 6 and 12 is still very good, but above 20, you might as well be carrying a plastic bag.

A waterproof jacket that doesn't breathe becomes a formidable trap when climbing. You'll end up wet from your own sweat, which will freeze as soon as you stop. The balance between waterproofing and breathability remains the Holy Grail for trail runners.

Beyond the numbers: the details that really matter

Technical data sheets do not tell the whole story in the field. The best-performing membrane on the market becomes useless if the cut is wrong. It is often in the The reliability of the product depends on its pure design..

Here are the key points to consider that transform a good jacket into elite equipment :

• The hood : must be adjusted, follow head movements and not obstruct vision.
• Seams: must be heat-sealed or waterproofed for a true impermeability.
• Zips: must be watertight (YKK AquaGuard zips, for example).
• Lightness and compressibility A good jacket should fit into a pocket of your bag without taking up all the space.

Never underestimate the importance of windproofing, even in dry weather. At high altitudes, even a light breeze can cause the temperature to drop dramatically. Your jacket must act as a heat shield to prevent any risk of hypothermia.

Compressport Thunderstorm Waterproof: the breathable fortress

Let's get down to business with this model that dominates the technical market, a true armour against the raging elements.

My opinion on the Thunderstorm Waterproof

This jacket stands out as a absolute protection against the elements. With its 25,000 Schmerber rating, water beads up and slides off without ever penetrating the Japanese fabric. It literally acts as a shield against violent storms at high altitudes. You remain protected, no matter how heavy the downpour outside.

But where it really stands out from the competition is its exceptional breathability of 75,000 MVTR. Most waterproof membranes end up making you sweat, but not this one. Moisture wicking is impressive, even during intense exercise. You'll forget that usual stuffy feeling.

The ergonomic cut hugs the body to prevent any unpleasant flapping in the wind. Details such as the fitted hood prove that it is designed for speed. It's pure precision equipment.

For what type of trail runner?

I recommend it to demanding trail runners who brave the mountains in all weathers. It becomes indispensable on ultras where the Equipment reliability is a matter of safety.. It is your ally in extreme conditions. It won't let you down when the going gets tough.

It is the choice of the one who refuses to compromise between protection and performance. If you are aiming for an UTMB or a Diagonale des Fous, this equipment makes perfect sense. You will not regret this technical choice.

For Sunday joggers or sunny outings, it is clearly oversized. Move along if you're looking for something basic.

Salomon Bonatti WP: the timeless classic

Now let's move on to a true monument of the circuit. Bonatti is a reliable choice that can be found on everyone's back, and it's no coincidence.

My opinion on the Bonatti WP

The Salomon Bonatti stands out as a a true icon on the trail. You probably see it at every starting line, worn by thousands of runners. It offers the reassuring balance that many people seek.

Its major advantage lies in its unbeatable lightness/protection/compressibility ratio. With its 10K/10K membrane, it will do the job in the rain for most of your outings. Once folded, it fits easily into the bottom of your bag.

I particularly appreciate its «Active fit» cut, which remains comfortable without flapping in the wind. It's a jacket simple, effective, rejecting unnecessary frills to focus on performance. She hits the mark and does it really well.

For what type of trail runner?

This is undoubtedly the ultimate versatile jacket For the pragmatic runner. It is ideal for beginner trail runners looking for their first serious equipment, as well as veterans who want reliable protection for 90% of their annual training sessions.

I recommend it for trails up to 80km in «normal» weather conditions, with moderate wind and rain. It passes the mandatory equipment checks on most official races without any problems.

However, it will show its limitations during prolonged heavy rain in high mountain areas. In this specific case, more technical models such as the Thunderstorm will take over.

Raidlight Top Extreme MP+: French versatility

Let us now turn to a French engineering company that has always known how to challenging the norms for demanding runners.

My opinion on the Top Extreme MP+

If I had to sum up this jacket in one word, it would be: clever. The Raidlight touch is immediately recognisable in the design. It's not just waterproof fabric, it's a tool designed by practitioners who know the reality of the terrain.

At the heart of the system, the MP+ membrane does the job with a 15K/15K ratio, a solid standard. But the real genius is this transparent window on the wrist. You can view your GPS trail watch without ever exposing your arm to the downpour or cooling your body.

In terms of fit, it's purely functional. It doesn't try to be the most beautiful on a hanger, but rather to get lost in the rain when you're clocking up the miles.

For what type of trail runner?

I would definitely recommend it to pragmatic trail runners. Those who don't care about marketing but want their jacket to perform when it counts. If you like useful gadgets that make life easier when running, it's the logical choice.

Its versatility is its major asset. It offers superior technical features compared to a classic Bonatti, making it more suitable for long distances. On an ultra, when fatigue sets in, this comfort and this extra protection become invaluable.

Scott RC Run WP: the featherweight of race days

My opinion on the Scott RC Run WP

We are looking at a minimalist jacket that pushes the boundaries of design. Scott has clearly made a radical choice: to eliminate everything superfluous in order to achieve absolute featherweight. It is like a second skin that you instantly forget you are wearing.

However, this quest for lightness imposes a technical compromise. Although the Pertex Shield membrane guarantees waterproofing and breathability in line with racing standards, it does not offer the robustness of mountain armour. Beware of brambles and repeated rubbing.

Its trump card remains its record compressibility. Once folded, it literally disappears into the palm of your hand or a belt pocket. It is the ultimate «mandatory safety» jacket for travelling light.

For what type of trail runner?

This model specifically targets the competitor obsessed with weight of its equipment. It is designed for runners who are looking to shave off every last gram on short to medium distances, where every second gained on equipment can make a difference to the final ranking.

It is perfect as a jacket to carry in your bag for races where the weather is uncertain but not apocalyptic. It allows you to meet the mandatory equipment requirements without compromising your running performance. The biggest difference is in terms of zero space requirement.

I'll give it to you. strongly advises against For regular training or technical outings in high mountains. In these hostile environments, durability and maximum protection are non-negotiable.

The verdict: how to choose the right jacket for your sport?

The best jacket is above all the one that suits you.

The personal equation: weather, distance and intensity

For extreme alpinists, aim for maximum protection (Compressport). For versatility, choose reliability (Salomon) or practicality (Raidlight). In competition, lightness is key (Scott). If you perspire a lot, opt for a low RET rating.

The detail that makes all the difference: compatibility with trail bags

Please note that the jacket is often worn over the bag. A cut that is too tight will block access to the flasks. Check these crucial points :

• Is the cup large enough to cover the bag ?
• Are the pockets still accessible? once equipped?
• Do the seams prevent chafing from shoulder straps ?

Be sure to try on the jacket with your equipment. Even the best trail hydration packs become uncomfortable with an unsuitable nappy.

Features	Compressport Thunderstorm	Salomon Bonatti WP	Raidlight Top Extreme MP+	Scott RC Run WP
Waterproofing	✅✅✅✅✅ (25K)	✅✅✅ (10K)	✅✅✅✅ (15K)	✅✅✅ (Compliant with regulations)
Breathability	✅✅✅✅✅ (RET < 6)	✅✅✅ (10K MVTR)	✅✅✅✅ (15K MVTR)	✅✅✅ (Compliant with regulations)
Lightweight/Compact.	✅✅✅	✅✅✅✅	✅✅✅✅	✅✅✅✅✅
Ideal profile	✅ Ultra-trail runner, extreme conditions	✅ Versatility, from beginner to expert	✅ Pragmatic trail runner, long distances	✅ Competitor, gram chaser
Strong point	✅ Protection and breathability without compromise	✅ Legendary balance and reliability	✅ Practical details (watch window)	✅ Featherweight and record compressibility
Weak point	❌ Less compact than the others	❌ Limits under prolonged flooding	❌ Design sometimes divisive	❌ Lower durability

Finding the perfect jacket ultimately depends on your personal goals and your favourite playing field. Whether it's braving Alpine storms or chasing the clock, the right equipment makes all the difference. Make your choice with confidence and enjoy every outing to the full, whatever the weather.

FAQ

What is the best jacket for trail running?

The frustrating but honest answer: it depends on your goal! If you're aiming for an ultra-trail in the mountains with unpredictable weather, the Compressport Thunderstorm is unbeatable for maximum protection..

For everyday versatility, The Salomon Bonatti remains the queen of the pack.. It's a bit like choosing between a Formula 1 car and a reliable 4×4: it all depends on the terrain.

Which jacket keeps you warmest?

Please note that a waterproof trail jacket is not a fleece! However, some models, such as the Raidlight Top Extreme MP+, offer a thicker membrane that better protection from the cold than an ultra-light model.

By completely blocking the wind (the «wind chill» effect), it retains your body heat better. This is a crucial advantage when crossing a mountain pass at an altitude of 2,500 metres in the middle of the night.

What is the best brand for trail running?

There is no single winner, but rather different philosophies. Salomon dominates the market with reliable and accessible products., perfect for making sure you make the right choice when purchasing.

If you like practical innovation (such as the watch window), the French brand Raidlight is at the top of its game. For pure performance and extreme lightness, Scott or Compressport often come out on top.

What is the difference between Gore-Tex and K-Way?

It's like night and day! The term «K-way» often refers to a basic waterproof fabric that protects you from the rain but makes you sweat like in a portable sauna 🥵.

Gore-Tex (and similar membranes such as MP+ or Pertex) is a microporous technology. It blocks large raindrops but allows vapour to escape of your perspiration, which is essential for running without ending up soaked from the inside.

What is the difference between Gore-Tex and waterproof?

This is a common misconception. «Waterproof» is a technical characteristic (water cannot penetrate), whereas Gore-Tex is a specific brand of membrane that makes fabric waterproof AND breathable.

All Gore-Tex jackets are waterproof, but not all waterproof jackets are made from Gore-Tex. Other technologies […] offer equally formidable performance..

What type of jacket is best for extreme cold?

For extreme cold weather, the onion strategy prevails on the jacket alone. You need a heavyweight waterproof jacket (such as the Raidlight) worn over an effective thermal layer.

Do not look for a lined trail jacket, as you will overheat on the first climb. Go for a highly protective windproof jacket (minimum 20,000 Schmerber) and manage heat with your underlayers.