The choice of outfit for a trail depends on several factors, including weather conditions, terrain and the duration of the effort. It is essential to dress in a way that ensures comfort, performance and safety. Here is a detailed guide to help you **choose the right kit** and stay at ease throughout your trail run, whatever the type of race.
The golden rule: avoid cotton
The fundamental rule in trail running is to **absolutely avoid cotton clothing**. Although comfortable in the short term, cotton has poor breathability. It has an unfortunate tendency to absorb perspiration, creating a **damp and unpleasant** environment.
This phenomenon can quickly cause your body to cool down, particularly in cold conditions or after exertion. To avoid this kind of situation, it is best to opt for **technical and breathable fabrics**, such as polyester, which wick moisture and allow your skin to stay dry.
The three-layer technique
Whatever the season, one of the best strategies for dressing for trail is to adopt the layering system. This system allows you to adapt your running kit to temperature variations and weather conditions, while optimising your comfort during physical exertion.
- Layer 1 The breathable layer: The first layer is essential for **wicking perspiration** and keeping your skin dry. It includes garments such as t-shirts or trail base layers in lightweight, breathable materials. This layer should sit close to the body to maximise its effectiveness.
- Layer 2 The insulating layer: The role of the second layer is to retain body heat while allowing moisture to escape. It can take the form of lightweight jackets, fleeces or thermo-regulating tops. This is an essential layer when temperatures drop or when it's windy.
- Layer 3 The protective layer: The outer layer protects you from mountain weather such as wind, rain or snow. It must be both waterproof and breathable to prevent condensation building up inside while keeping you dry. Opt for a lightweight trail jacket, easy to put on or take off as needed.
The must-haves, whatever the weather and terrain
For your feet: They are one of the most heavily used parts of the body in trail running, so it is essential to choose **quality socks**. Opt for seamless ones or those with flat seams. This helps limit the friction that causes blisters. Models with reinforced heels and toes are also an excellent choice.
Base layers: Choose base layers that are **technical, breathable and seamless**. For women, a sports bra or bra top adapted for trail is essential, with crossed and wide straps for better support.
Dressing for a trail run in warm weather
When temperatures rise, the goal is to stay as light and breathable as possible, while ensuring good skin ventilation.
- Tops: A short-sleeved t-shirt or a vest in a quick-drying technical fabric is ideal. The fitted cut allows for greater freedom of movement while reducing chafing.
- Bottoms: Shorts are the obvious choice during summer. However, make sure they are well cut to **reduce chafing** between the thighs.
- Accessories: A breathable cap is essential for protecting your eyes from the sun, along with sunglasses to preserve your vision.
Dressing for a trail run in wet weather
Even in the rain, it is possible to stay comfortable and dry.
- Tops: Wear a technical t-shirt with long or short sleeves depending on the temperature, along with a **lightweight waterproof jacket** to protect you from the rain. Choose a water-repellent jacket for light rain or a more waterproof one for heavy downpours. Lightweight and compact, this jacket can be easily **packed away in your bag when the weather improves**.
- Bottoms: In rainy conditions, waterproof trail trousers or overtrousers are an option to stay dry. It's also possible to stick with shorts depending on your preference!
- Accessories: A cap can be useful for protecting your hair and eyes from the rain. If you wear **sunglasses**, you'll appreciate a model with an **anti-fog treatment**.
Dressing for running in cold weather
In extreme cold, the three-layer system really comes into its own. Maintaining your core temperature while regulating moisture is essential.
- Tops: The first layer should also be breathable, such as a technical t-shirt. Go for long sleeves. For the second layer, wear an **insulating fleece** to retain heat. Finally, the third layer should be a windproof and waterproof jacket, protecting you from the elements.
- Bottoms: Long tights are strongly recommended in winter to prevent heat loss from the muscles.
- Accessories: A beanie to cover your head is very useful, as body heat escapes primarily **through the extremities**. If you don't like being too wrapped up, a headband ear warmer can be enough. A light scarf or neck gaiter is also a useful accessory to protect your neck.
- Hands: A pair of trail running gloves is essential for retaining body heat, especially if the temperature drops. Choose a breathable fabric to ensure good moisture management.
Quality gear for optimal trail performance
When choosing your trail clothing, opt for technical and breathable fabrics, such as those offered by Cimalp, which incorporate fabrics like **3D-Flex** for a better fitted hold and optimal muscle compression. The jackets on offer are **packable**, folding easily into a small pocket for hassle-free transport.
By choosing the right equipment, you'll be able to enjoy your runs in all conditions, staying comfortable and performing at your best, whatever the weather. Also check out our guide on preparation and gear for ultra trail.
