I took the Asics Fujitrail waterproof jacket on a 20km trail run in severe weather warnings – here’s how it performed

If you're serious about trail running, you’ve likely heard about the Asics Fujitrail waterproof running jacket, and for good reason.

Designed by the Asics Institute of Sport Science (ISS) and co-created with trail athletes, it stands out as a top-tier option for those tackling tough, technical terrain in unpredictable conditions.

With Pertex Shield 2.5 layer fabric (20K/20K) at its core, this jacket is made to be fully waterproof, highly breathable and durable enough for all-day use.

While we’ve tested plenty of lightweight running jackets, what makes the Fujitrail really unique is its versatility. This is a piece of gear that’s ready to take on mountain storms, but it’s also functional and comfortable enough to wear over a rucksack or pack away when not needed.

The question is, does it balance performance and comfort perfectly? Let’s dig in and find out if it deserves a place on our list of the best waterproof running jackets.

Design and features

Right out of the gate, it’s clear that Asics went for a functional design without sacrificing style. Available in matte, muted colours, this jacket doesn't scream for attention, but it still stands out against the environment — whether that’s the mountains or the forest.

Unlike some competitors that opt for bright, traffic-cone orange (looking at you, La Sportiva Pocketshell), the Fujitrail Waterproof provides a balanced aesthetic.

When it comes to features, the jacket shines in adjustability. The technical hood includes a triple adjustment feature, allowing for a snug fit no matter the conditions.

Pair this with a waterproof chest pocket for securely storing essentials like your phone, keys or energy gels, and you've got plenty of practicality without the bulk.

The reflective strips on the arms and small reflective logos on the front and back add a touch of safety, but they aren't quite as noticeable as those found on other jackets. However, the zips and drawstrings, finished in neon, ensure that you’ll still be visible during early morning or late-night runs.

While the jacket can feel slightly boxy when first worn, cinching the hem solves this problem, securing the fit and keeping wind and rain out.

For those moments when you need more airflow, loosening the hem helps improve ventilation, though this trick may be more of a user workaround than a deliberate design feature.

Performance and comfort

This jacket really excels in one key area: comfort. Thanks to the Pertex Shield 2.5-layer fabric, the Fujitrail offers impressive breathability and feels great against the skin.

While some waterproof jackets can feel stiff or crinkly, this one is soft and malleable, making it feel more like a second skin than a protective outer shell.

Whether you're running long stretches or tackling technical climbs, the ergonomic design allows for freedom of movement, helped along by the drop shoulder construction.

However, the Fujitrail isn’t without its limitations. While the 20K/20K waterproof rating does provide excellent protection in mild to moderate rain, prolonged exposure in heavy downpours can leave you feeling a bit damp. The jacket begins to saturate after long periods in tough weather, so it might not be your best bet if you’re heading into the stormiest conditions.

But the trade-off is a jacket that doesn’t trap heat. For those of us who run particularly warm, the Fujitrail delivers consistent airflow, even when zipped up. It’s perfect for high-intensity runs where overheating is a real concern.

While this may limit its versatility as an all-around hiking jacket, it’s a perfect fit for runners looking for a specialised, breathable outer layer for wet but not torrential conditions.

Sustainability

Like many in its category, the Fujitrail waterproof jacket faces challenges in sustainability. While Asics has been making strides toward more eco-friendly practices, there isn’t much indication that this specific model uses recycled materials or processes, unlike some of its competitors like the Patagonia Storm Racer.

That said, the durable Pertex Shield fabric ensures the jacket will last for a long time, reducing the need for frequent replacements – a plus in terms of sustainability.

Still, those looking for a greener option might consider jackets with more transparent eco-credentials.

For example, Patagonia’s focus on recycled materials and fair labour practices edges it ahead in this category. And the La Sportiva Pocketshell performs about as well, but uses 100% recycled materials. Asics could definitely benefit from making similar steps forward with the Fujitrail.

Price and competition

At £187 ($215), this jacket sits in the higher price range for trail running jackets at, (though since we're towards the end of its run, you'll find a good amount of discounts) and it’s worth considering whether you need all the features it provides.

Retailing at a similar level to high-performance models like The North Face's Futurelight, the Fujitrail also brings around the same level comfort and breathability to the table, though it has a lot more adjustability than the TNF jacket.

If you're someone who doesn’t mind throwing down cash for a jacket that offers exceptional comfort and breathability on intense runs, this is a great investment.

However, if you’re looking for a jacket that will keep you dry in torrential conditions, the Inov-8 Stormshell V2 or the Compressport Thundercross might be a better alternatives, with slightly better waterproofing at the cost of added weight and reduced airflow.

The Inov8 Stormshell comes at a more accessible price and provides top-tier rain protection, but it can run hot, especially during warmer months.

Meanwhile, the Patagonia Storm Racer stands as a direct competitor in terms of price and build quality, but its heavier design may not appeal to runners looking for an ultra-light option like the Fujitrail.

Verdict

The Asics Fujitrail Waterproof Jacket is a niche but highly effective option for serious trail runners. Its breathability, comfort and freedom of movement are unmatched, making it a standout for high-intensity runs in wet conditions.

While it doesn’t offer complete protection in torrential downpours, it more than makes up for it with ventilation and temperature regulation, allowing you to stay dry and comfortable during moderate rain.

For those who prioritise comfort and breathability over full-on waterproofing, the Fujitrail is a premium option that performs beautifully on the trail. Just keep in mind that there are more robust options out there if weather protection is your top priority.

About the author

Your tester for the Asics Fujitrail jacket is Milo Wilson, a long-serving member of the LFTO team. He joined us back in May of 2023 and took over the mantle of the trail running section at the start of 2024.

Rain or shine, summer or winter, you'll find Milo exploring his local trails in the Surrey Hills on his ritualistic Sunday long runs, during which he likes to challenge himself by wearing out a new pair of trail running shoes every other month. So, if you see him reviewing any footwear, you can be sure it's been beaten to hell.

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