Whatever trail run you plan to tackle, you will certainly need a jacket. Even if you are not sure you will wear it during the race, it will come in handy during your warm-up and must remain within easy reach if conditions turn. A trail jacket is therefore an essential gear choice: both for total protection and to run naturally.
Trail jacket: the different types of jackets to choose
There are virtually as many trail jackets as there are weather conditions. While that may sound exaggerated, it is close to reality. Depending on the daily forecast and where you are heading (region, season, and altitude), it is up to you to decide which trail jacket to pack. In short, you need a versatile range of jackets to cover whatever weather the mountains throw at you.
If you are a dedicated trail runner out in all seasons and across all terrains, you clearly need the complete setup. Adapt your kit to your specific outings: if you only run trail at low altitude and in mild climates, you can do without a heavy insulated jacket. However, going without a windproof jacket and a waterproof jacket is out of the question.
Trail jacket: the windproof jacket
This is certainly the one you will pack in your rucksack just in case. Even if the forecast looks good, you are never safe from a chilly gust of wind on the ridges or even a light shower. Against a quick squall, a windproof jacket can protect you. It is also very useful for warming up or after your trail run to keep from getting too cold.
Choose an ultra-lightweight and packable jacket: these two features are essential for keeping it handy and stashing it easily into your rucksack. You can also opt for reflective detailing for added safety in low light. For weather resistance, a DWR (durable water-repellent) treatment is required to keep moisture out for at least 30 minutes to an hour, depending on rain intensity.
Trail jacket: the waterproof jacket
A waterproof jacket must be packed whenever rain is in the forecast. It is crucial to have a good waterproof jacket. Running for hours with rain soaking through close to your body is not only unpleasant, but it also increases the risk of injury, makes you catch a chill, and impairs muscle efficiency. Choose a jacket with a 10,000 mm Schmerber rating, which provides effective protection during heavy, prolonged downpours.
The ideal setup is a jacket that combines waterproofing, breathability, and unrestricted freedom of movement. The fabric should feature a membrane combining lightness and stretch with a fine-pore structure that maximises airflow while offering greater durability.
Trail jacket: the warm insulated jacket
For colder spells or high-altitude outings, you will need a jacket to protect against the cold. Choose it wisely: it must provide effective thermal protection without hindering your pace or effort. Make sure to pick a jacket that offers full freedom of movement and never feels bulky.
The second key factor to check is breathability. This is crucial because even in cold weather, running generates sweat and heat. If your jacket prevents body heat and moisture from escaping, you will quickly find yourself trapped in a very uncomfortable sauna effect.
It is essential to choose a jacket that combines these performance features with stretch in the fabric. Do not overlook durability either. Trail running often takes you into the heart of the wild, and your jacket must withstand rocks, branches, and rough vegetation.
Keep your selection of jackets ready in your car before your trail run, then pick the right one based on the actual conditions. Never make the mistake of heading out without a jacket; it is always a costly oversight. Most modern lightweight jackets weigh next to nothing, allowing you to carry them on any terrain!
