Weather conditions in trail running can change fast. Out in the wild, and especially in the mountains, running into rain is common. To run in optimal conditions and stay safe, choosing the right rain gear for trail running is essential.
Key takeaways:
- Good gear ensures comfort, safety, and performance in trail running.
- Waterproofing, breathability, lightness, and packability are the primary criteria to consider.
- Base layers must be suited to wet conditions.
- Specific accessories complement your wet-weather kit perfectly.
The importance of proper gear for rainy conditions
Choosing the right trail clothing for rain is about more than comfort: it is also a matter of safety. In bad weather, visibility drops, the ground becomes slippery and there is a risk of hypothermia.
Getting wet lowers your body temperature, forcing your body to burn more energy to stay warm. This drop in energy directly impacts your motivation. It is therefore vital to wear gear that maintains thermal comfort, seals out rain, and lets sweat escape.
Trail running involves constant movement. Wet clothes, however, tend to cause chafing. To prevent injuries and irritation, wear a well-fitted kit designed specifically for the conditions to minimise risks.
Finally, race conditions become significantly more technical in the wet. Rocks turn slick, trails get muddy, and visibility drops. Proper gear keeps you sharp and responsive, reducing the risk of slips, falls, and navigation errors.
Criteria for choosing rainwear in trail running
Several factors matter when choosing rainwear for the trail. Waterproofing is the most important: it protects you from rain, helps prevent your body cooling when wet and prepares you for unpredictable weather. It is measured in millimetres of water column (Schmerber). For running in the rain, we recommend trail jackets with a minimum waterproof rating of 10 000 mm.
Breathability allows perspiration to escape, regulates body temperature more effectively, and maintains comfort on the move. Breathable fabrics prevent that clammy, sticky feeling during a trail run. Breathability is measured in RET (Resistance to Evaporative Heat Loss) or MVTR (Moisture Vapour Transmission Rate). For trail running, we recommend choosing clothing with a RET rating below 6 or an MVTR of at least 10,000 g/m²/24h.
In trail running, every gram counts, so lightness is key. Lightweight kit is more comfortable, packs down smaller, and causes less chafing thanks to seamless construction.
Just like lightness, packability is a tactical advantage during a race. When space is at a premium, packable garments fold into themselves or stow neatly into a pocket, making them quickly accessible when sudden rain hits.
Essential base layers to choose in wet weather
A trail running jacket is an absolute must in wet weather. It should be waterproof, breathable, and lightweight (around 150 to 200 grams). For better protection, opt for a model with a peaked hood. Beyond shielding your face from wind gusts and raindrops, it improves visibility and comfort.
There are several options for your lower half. Waterproof trail trousers are ideal in prolonged rain. Waterproof overtrousers, worn over tights or shorts, are a good alternative when the weather is uncertain. For light rain, water-repellent, windproof leggings may be enough.
Technical base layers play a crucial role in temperature and moisture management. Avoid cotton entirely; opt instead for synthetic technical fabrics or merino wool. To prevent chafing, choose a close-fitting cut that dries quickly.
When choosing your trail running socks, breathability is crucial to wick moisture away effectively. Socks made with merino wool stay warm even when wet. Some brands also offer waterproof pairs for extra protection.
Accessories such as a cap, neck warmer or lightweight water-repellent or waterproof gloves are useful in the rain. Remember to choose an effective trail head torch and wear reflective details to stay visible.
Choosing the right wet-weather gear for trail running is not that complicated, provided you consider certain criteria. Also make sure to check that it complies with mandatory kit requirements for specific trail races like the UTMB. That way, you can run with complete peace of mind.
Photo credits: Delphine Danielou
