Trail running is a demanding sport done in a wide range of conditions — from scorching heat to driving rain. Having lightweight, breathable gear that also delivers weather protection helps to keep you focused on the trails, and not your clothes. Arc’teryx works closely with professional athletes to design the best trail running pants for putting in the miles all year long.
Know the demands of your trail running conditions
Why weather-specific gear matters
Trail runners log many hours on the trails and aren't deterred by inclement weather. They train in the alpine cold, rainforest humidity, and high-desert sun and need pants that protect them from the conditions, help regulate temperature, and don’t impede mobility. The best trail running pants are technical and specialized, with features that help you perform at your best without weighing you down.
Three core conditions to plan for
It’s important to choose the best pants for the conditions you’ll be training in. Winter running pants with lightweight insulation and wind protection are best for cold conditions. If it’ll be damp and rainy, prioritize pants that are completely waterproof with good breathability. If you’ll be running in exposed, hot conditions, moisture-wicking fabrics, a looser fit, and sun protection are key.
Cold weather and winter running pants
Key features for cold protection
When you’re training in cold weather, the best protection is an efficient, slim-fit layering system to deliver warmth without excess fabric or bulk. Start with a breathable, lightweight base layer for insulation and then add a wind-blocking outer layer to keep out mountain gusts.
Arc'teryx solutions for winter runs
Arc’teryx athletes train in punishing alpine conditions and need technical solutions for long hours in the mountains. We’ve developed cold-weather trail pants that deliver thermal efficiency with loft-free insulation and wind protection to keep you warm when you’re moving fast in high-output situations. Designed specifically for maximum mobility on rocky, rooty, or icy trails, our trail running pants feature articulated patterning and gussets to allow for stride efficiency even in tight terrain. All our trail pants are designed to pair with base layers if you need an additional layer of insulation.
Wet & rainy conditions: waterproof trail running pants
Fully waterproof vs. water-resistant
Different kinds of waterproofing technology deliver specialized weather protection in a wide range of conditions — from sideways, driving rain to a damp, drizzly morning. It’s important to understand what you’re looking for when picking a waterproof trail running pant: GORE-TEX® styles will be completely waterproof and are best in steady-rain situations for a sustained period of time, pants with a DWR (Durable Water Repellent) finish will deliver good wet-weather protection in lighter-rain conditions.
Essential rain features
There are a few critical features to look for in waterproof trail running pants. If it’s forecasted to be raining sideways, you’ll appreciate gear that is completely waterproof with taped seams and stormproof zippers to keep you dry. Ankle zippers make it easy to de-layer when you’re on the trail, and lightweight packability is key for easy stowing. A secure, distraction-free elastic waistband keeps your pants in place when you’re moving fast on rocky terrain.
Arc'teryx waterproof technologies in action
Our Norvan Shell Pant is a highly technical, minimalist, completely waterproof layer designed specifically to keep you dry on long-distance, high-output training runs. Ultralight GORE-TEX fabric seals out wind, rain, and snow, and a breathable backer is soft on the skin and won’t get clammy when you’re pushing the pace.
Hot, sunny, or variable conditions: lightweight trail running pants
Why you still need pants in the heat
When temperatures are hot and you’re running on exposed alpine ridgelines or in open terrain, lightweight pants with sun protection help to keep your skin protected from UV rays, insects, and scrapes. A looser fit will encourage airflow to keep you cooler. Abrasion-resistant fabric will help you avoid branches or other snags if your route includes bushwhacking.
Lightweight and breathable materials
Quick-drying, moisture-wicking fabrics will help regulate temperatures to keep you cooler in hot, sweaty conditions. Prioritize lightweight fabrics that are protective without weighing you down. Some of the best trail running pants for warm conditions have mechanical ventilation zones to encourage airflow or zippered hand pockets that double as vents.
Arc’teryx gear for warm weather trails
Running pants with a looser fit will help air to circulate and regulate temperatures when you’re working hard in hot conditions. Looser fit pants made of a lightweight material will keep you cooler than form-fitting running tights that don’t allow airflow and keep moisture trapped next to the skin.
How to choose the right fit and features for your run
Fit considerations
Choosing the fit of your trail running pants certainly includes technical considerations, but it’s also important to feel comfortable and supported in the gear you’re running in. For many trail runners, having a variety of pants for different objectives and conditions helps to make the most out of every training run. That being said, there are a number of general guidelines to help you choose the most efficient fit for your mission. If you like a looser fit for mobility and airflow in warmer conditions, make sure to avoid excess fabric that can snag on rocks or branches. If you’re picking a slim fit, prioritize good range of motion — articulated knees, a gusseted crotch, and tapered legs keep you moving fast in the mountains.
Storage, waistbands, and adjustability
The best trail running pants have design priority placed on features that are lightweight and high utility. Having a few, no-bounce, zippered hand pockets for keys and fuel is critical for the training runs when you don’t want to wear a vest. Pick an elastic waistband with an internal drawcord for additional adjustability that’s comfortable on your skin and secure enough that your pants will stay in place when you’re moving fast in technical terrain. Hem cinches help to adjust length and prevent snags on branches or roots. Ankle zippers make de-layering easy when you’re on the trail and want a quick transition.
Final tips: layering, care, and when to upgrade
How to layer trail pants with base layers
Having a comprehensive trail running pants layering system is critical for temperature regulation and safety in inclement, cold weather. Start with a breathable base layer in a lightweight material next-to-skin and then layer on top of this with waterproof or wind-resistant pants according to the forecast and temperatures. To avoid overheating, pick packable layers that you can easily take on and off in variable conditions.
Care tips to extend the life of technical pants
Technical trail running pants are designed to be long-lasting gear and they will stay protective for years of high-mileage runs. Make sure to reapply DWR care treatments as recommended by the manufacturer to keep them waterproof. Don’t forget to wash membrane-safe pants periodically to clear them of dirt and sweat. As always, read the labels and care guides for your pants and check out our expert advice for full care tips for your outdoor apparel and gear.
Conclusion: prepare for any trail, any weather
The best trail running pants aren’t just one pair — they’re the best pair for your objective and the weather conditions. Weather protection, range of motion, and technical fabrics can greatly improve any trail running experience. Dig into the full Arc’teryx trail running collection to help equip yourself for the gamut of mountain conditions.
2026-06-29
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