The choice of outfit for a trail depends on several factors, including weather conditions, terrain and the duration of the effort. It's essential to dress in a way that guarantees comfort, performance and safety. Here is a detailed guide to help you choose the right outfit and stay comfortable throughout your trail, whatever the type of race.
The golden rule: avoid cotton
The fundamental advice for trail is to avoid cotton clothing at all costs. Although comfortable in the short term, cotton has poor breathability. It tends to absorb sweat, creating a damp and uncomfortable environment.
This phenomenon can quickly lead to your body cooling down, particularly in cold conditions or after exertion. To avoid this kind of situation, it's best to opt for technical, breathable fabrics, such as polyester, which wick moisture away and allow your skin to stay dry.
The three-layer system
Whatever the season, one of the best strategies for dressing in trail is to adopt the multi-layer system. This system allows you to adapt your running kit to changing temperatures and weather conditions, while optimising your comfort during physical exertion.
- Layer 1: the breathable layer: The first layer is essential for wicking away sweat and keeping your skin dry. It includes lightweight, breathable garments such as trail T-shirts and base layers. This layer should fit close to the body to work effectively.
- Layer 2: the insulating layer: The second layer retains body heat while allowing moisture to escape. It might be a lightweight jacket, a fleece or a temperature-regulating top. This layer is essential when temperatures drop or the wind picks up.
- Layer 3: the protective layer: The outer layer protects you from mountain weather, including wind, rain and snow. It needs to be both waterproof and breathable to prevent condensation inside while keeping you dry. Choose a lightweight trail jacket that’s easy to put on or take off as needed.
The must-haves, whatever the weather and terrain
Feet: They are one of the most heavily worked parts of the body in trail, so it's vital 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 technical, breathable and seamless base layers. For women, a trail-specific sports bra or crop top is essential, with wide crossed straps for better support.
Dressing for a trail run in hot weather
When temperatures rise, aim to wear clothing that is as light and airy as possible while allowing good ventilation for your skin.
- Top: A short-sleeved t-shirt or a vest made from quick-drying technical fabric is ideal. A close fit allows greater freedom of movement while preventing 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 helps shield your eyes from the sun, while sunglasses protect your vision.
Dressing for a trail run in wet weather
Even in the rain, it's possible to stay comfortable and dry.
- Top: Wear a technical long- or short-sleeved t-shirt depending on the temperature, followed by a lightweight waterproof jacket to protect you from the rain. Choose a water-repellent jacket for light rain or a more waterproof one for a heavy shower. Lightweight and compact, this jacket can be easily packed away in your bag when the weather improves.
- Bottoms: In the rain, trail trousers or overtrousers that are waterproof can help keep you dry. You can also stick with shorts if you prefer!
- Accessories: A cap can be useful for protecting your hair and eyes from the rain. If you wear sunglasses, you will appreciate a model with an anti-fog coating.
Dressing to run in cold weather
In extreme cold, the three-layer system really comes into its own. It's essential to maintain your core body temperature while managing moisture.
- Top: The first layer must also be breathable, such as a technical t-shirt. Opt for long sleeves. For the second layer, add an insulating fleece to retain warmth. Finally, the third layer should be a windproof and waterproof jacket, protecting you from the elements.
- Bottoms: Long tights are highly recommended in winter to prevent muscular heat loss.
- 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 covered up, an ear warmer headband may be enough. A lightweight scarf or neck warmer is also a useful accessory for protecting your neck.
- Hands: A pair of trail running gloves is essential for keeping your hands warm, especially when temperatures drop. Choose a breathable fabric that lets moisture escape.
Quality kit for an optimal trail
When choosing your trail clothing, look for breathable technical fabrics, such as those used by Cimalp. These include 3D-Flex for a better close fit and optimal muscle compression. The jackets are packable, folding easily into a small pocket for convenient carrying.
With the right kit, you can enjoy your runs in any conditions while staying comfortable and performing at your best, whatever the weather. Read our guide to ultra trail preparation and kit too.
