You might think you don’t need anything more than a good pair of shoes to hit the trails. While good footwear is certainly important, having the right trail running clothes will elevate your performance while keeping you safer and more comfortable on the mountain. Unlike running on roads, trail running is often unpredictable and variable, with steep climbs descending into muddy forested trails before climbing again and less accessible aid if things go sideways. You need to be ready for it all.

Weather, terrain, and running distance all dictate your trail running apparel needs—you’ll go further in moisture-wicking, durable, and weather-resistant clothes. At Arc’teryx, we design and test all our trail running gear to perform under real-world conditions. From muddy coastal paths to rugged alpine routes, we’re on the trail with you.

That’s why we created this checklist for a range of conditions and climates: so you can hit the trail prepared. Whether you’re a seasoned ultra runner or just getting started, this guide is designed to make sure you’re equipped for whatever adventure the mountains bring.

The right shirt enhances performance by reducing chafing, managing moisture, and adjusting to changing trail conditions as you do. For peak adaptability, we love the Norvan DownWord Logo Shirt for men and the Norvan Crew Neck for women. Built for high-output days in the mountains, the Norvan is made with 100% recycled, odour-resistant Phasic™ FL fabric that wicks away moisture and maximizes airflow. It also comes in a long-sleeved version for men, and a tank in both men’s and women’s for warmer days in the mountains. For a long-sleeved option for women, the Taema Crew Neck Shirt offers similar softness and breathability for trail runners. It also offers UPF 40+ sun protection and anti-odour treatment.

If you prefer Merino wool, check out the Ionia Merino Wool Shirt for men (also has a long-sleeved version) and the Lana Merino Wool Crew Shirt for women (or tank version) for high-output runs in varying temperatures and terrain. Merino wool is naturally odour-resistant, soft, and moisture-wicking for all-day comfort. In the Ionia, the Merino fibres wrap around a nylon core in the fabric for extra durability against snags and scratches on forested trails.

Shorts and pants

When the sun is warm and the trails are dry, trail running in breezy shorts can feel amazing. Shorts offer maximum ventilation and freedom of movement for light trail running on well-groomed paths. On rocky peaks or exposed ridgelines, however, you often want the protection full-length pants offer against brush, rocks, and sudden weather changes. Whether you prefer shorts or pants, look for quick-drying and stretchy materials that allow you to move unrestricted. The best trail running pants combine breathability with abrasion resistance, since you might be running among tree branches, loose rocks, and scree fields, or other unpredictable surfaces.

To further minimize snagging, look for mountain running apparel with a trim, articulated fit. For long runs or multi-day adventures, durability becomes even more important as you’re exposed to more weather and general wear and tear.

Moisture-wicking, odour-resistant, and comfortable, the Norvan Short is made for trail running. With a men’s cut and a women’s cut in a 5” inseam, the running-specific patterning, low-profile seam construction, and the next-to-skin fit of the brief liner all work together to reduce chafe and irritation. The Norvan also comes in a 7” inseam for men and a 3” inseam for women.

If you’re looking for trail running pants, try the men’s Incendo Pant. Super breathable and stretchy, they’re streamlined for ultimate freedom of movement, and the adjustable waist and ankle cuffs ensure the best possible fit. For trail running leggings, we love the Essent High-Rise Utility Legging for women. The Essent is also available as a short for women who prefer to run in next-to-skin shorts rather than loose ones, available in both a 6” inseam or 8” inseam. The Chira material is both abrasion-resistant and breathable, and mesh paneling on the lower legs provides extra ventilation. The thigh pockets offer quick and easy access, and a zippered waistband pocket gives you added security when you need it.

Jackets (wind, rain, and cold)

If you think you only need a jacket for cold and rainy days on the mountain, think again. A trail running jacket is a must-have layer for fast-changing mountain weather. On warm, sunny days, a lightweight windbreaker can protect you from sudden gusts of wind and high-altitude sun exposure without keeping you overly warm. Plus, even on a clear day, you never know when the weather could change. For colder, stormier days, a breathable waterproof jacket can shield you from the elements while still allowing sweat to escape. We love GORE-TEX® jackets for their perfect balance of breathability and weatherproofing.

It’s always better to be safe than sorry, especially if something goes sideways when you’re in the mountains, so we’ve designed trail running jackets that are packable and lightweight. Look for compact, stowable trail running jacket options, like the Norvan Jacket for men and the Incendo Airshell Hoody for women. While the Norvan is waterproof and the Incendo is weather-resistant, both jackets are excellent as standalone layers and super packable.

Hydration packs and carry solutions

Hydration packs are essential for longer mountain runs, especially when you're venturing beyond easy access to clean water sources. On short runs under an hour, a handheld bottle or waist belt might suffice, but for anything longer, you’ll want a hydration pack to maintain your energy, carry extra layers, and stay safe.

Look for packs with breathable, body-hugging designs that minimize bounce, keeping you comfortable and avoiding chafing during high-output movement. Your pack should fit like an extension of your body, which is why we love the minimalist Norvan 7 Vest.

As a general rule, you should carry at least 500mL of water for every hour of running, and that volume should increase in hot weather or especially challenging terrain. For runs longer than two hours, you should also bring electrolyte supplements and easily digestible nutrition, like gels or chews. Like the men’s Norvan 7 Vest or the Norvan 7 Vest specifically designed for women, some hydration vests also have space for emergency layers, a phone, and trail snacks, making them ideal for long days out on the trails., With narrower shoulder straps and more space in the chest, women-specific vests and hydration packs are designed specifically to fit women’s bodies for maximum comfort.

Footwear essentials

There’s a lot more we could say about outdoor shoes (and we did here), but to keep it simple: high-output days on the trail require high-performance shoes. The best trail running shoes are both lightweight and durable, shedding grams wherever possible so you can move fast and light while still providing waterproofing and weather protection.

Ultra-lightweight and breathable, shoes for light trail running closely mimic road shoes. For rugged mountain running, you want your shoes to be a bit more rugged, too. Arc’teryx trail shoes use Vibram® Megagrip outsoles with LITEBASE technology to shed weight without sacrificing performance. On the race-inspired Sylan Pro Shoe (men’s and women’s), for example, aggressive lugs provide excellent traction even in slippery conditions. Built for moving through vertical terrain at speed, the Sylan takes racing shoes to new heights.

Arc’teryx’s Adaptive Fit Technology is designed to deliver a personalized, sock-like fit that enhances comfort and support on high-output days. It wraps around the foot snugly to reduce pressure points and potential hot spots. As seen in the Norvan LD 4 shoe for men and Norvan LD 4 for women—our favourite trail running generalist—it’s integrated into the shoe’s midsole and upper to deliver maximum comfort. Adaptive Fit Technology also provides excellent shock absorption and energy return, which reduces fatigue on long, steep trail excursions. If you’re running on especially steep and technical rocky terrain, you might want more of a hybrid shoe that combines the best from trail runners and climbing shoes, which is where our Vertex Speed Shoe comes in. If you’re running in wet or muddy conditions, check out our waterproof trail runners specifically—the Norvan, and Sylan all come with GORE-TEX (GTX) options.

With all this talk about shoes, don’t underestimate the importance of technical socks to keep your feet happy. Moisture-wicking trail running socks are critical to prevent blisters and improve your overall comfort on the trail. Unlike cotton, which traps sweat and creates friction, running socks made from wool or synthetic blends wick moisture away from your skin, keeping your feet drier and reducing the risk of hot spots. As an added bonus, many technical socks offer targeted cushioning and seamless designs for extra support and comfort for long, high-output days, like our Synthetic Mid Crew Sock.

Sun, wind, and chill protection

When you’re moving fast and light, it’s easy to leave behind accessories like hats, gloves, and neck gaiters. But these additions can be vital when running on coastal trails with strong winds or in the high alpine where the temperature can drop suddenly and dramatically. Mountain running caps shield your face from sun and rain, while other accessories like gloves and gaiters can keep you warm on your descents. Gloves can also serve as added protection on rugged terrain when you’re using your hands and scrambling through rough mountain environments.

A crowd favourite, the Aerios 5 Panel Hat offers both sun protection on clear days and DWR (Durable Water Repellent) protection in unexpected rain. In colder weather, be sure to pack the Rho Gloves and Rho Neck Gaiter for additional breathable warmth.

Warm weather and short runs

In warm weather and on shorter runs where you’re not going deep into the backcountry, you don’t need as much gear. With a breathable technical trail shirt and shorts, you don’t need many additional layers. Whenever you’re running on trails with a lot of sun exposure, make sure your apparel is both sweat-wicking and UPF-rated to protect you from UV rays. Mesh-backed packs like the Norvan 7 Vest and ultra-lightweight gear are perfect for high-heat, high-output days.

Rugged, technical, or long runs

When running on rugged trails, technical terrain, or for longer runs, you want to prioritize durability and protection along with lightweight breathability. Running through the forest increases your risk of snagging on rogue branches or passing through thorny brambles, so durable protection is especially important. Depending on the density of the brush, forested trail runs may also call for long sleeves and tougher outer shells that are more abrasion-resistant.

In all environments, performance fabric is superior to cotton. Cotton apparel not only traps sweat and moisture, but it also stays wet for longer, and it tends to be heavier and bulkier. Performance technical fabrics like nylon and Merino wool, on the other hand, are moisture-wicking, fast-drying, and lightweight, making them the preferred materials for trail runners. Storing your fuel and emergency layers in a run vest will ensure you have all the essentials with you when you hit the trail.

Cold weather runs and high elevation

When you’re running in cold weather or at high elevation, layering is the name of the game. Focus on a moisture-wicking, lightweight base layer, an insulated but packable midlayer, and a windproof or waterproof outer shell. To stay warm without overheating, prioritize breathable insulation, and if you need more warmth or weather protection, you can throw your shell jacket on top. For drastic elevation changes and steeper climbs, packability is key. You might be sweating in only a short-sleeve shirt on your ascent but get chilly on a windy ridgeline or less intense descent, so you’ll want to make sure your layers are available when you need them and stowable when you don’t.

Ready to build out your own kit? Here’s a handy checklist broken down by tops, bottoms, outer layers, and footwear and accessories. Remember, you might not need everything in every category! Consider your local trails, seasonal weather, and personal preferences when deciding.

Base layers

• Short-sleeve technical shirt
• Long-sleeve technical shirt

Bottoms

• Lightweight, moisture-wicking shorts
• Weather-resistant pants
• Insulated or lined base layers

Outerwear

• Light windshell
• Softshell offering light weather protection and warmth
• Fully waterproof, breathable hard shell

Footwear and accessories

• Multi-terrain running shoes
• Performance socks
• Small pack, run vest, or belt
• Hat
• Gloves
• Neck gaiter

Whether you’re grinding up steep climbs or flying down technical descents, we know your clothing should work as hard as you do. At Arc’teryx, we design every piece of apparel specifically for the demands of mountain athletes. We’re not just repurposing road-running gear. Every piece in our Mountain Run collection is engineered with performance at the forefront: from proprietary fabrics like Phasic™ LT that are ultra lightweight and breathable for high-output activities, to design details like smaller seams and strategic insulation that reduce bulk and maximize movement.

Our design philosophy is simple but uncompromising: minimal weight, maximum function. We know every gram matters on the trail, and we don’t take any of them lightly. We build our trail running apparel with durable, purpose-driven materials that can withstand anything from abrasion to unexpected weather turns. Articulated patterning means your clothes move with you and breathable materials ensure you can go hard without overheating.

As you prepare for your next mission, take a moment to assess your kit. Does it have your back if a storm rolls in or the terrain gets sketchy? Does your gear support your movement and make your life easier, or do you feel like you’re fighting against it? Whether you’re an experienced trail runner or novice, we want to help you fill in the gaps.

The Arc’teryx Mountain Run collection is more than just gear—it’s a dialed-in, trail-ready system built to help you move faster, stay safer, and go farther. Because when you're deep in the backcountry, the right clothing is about unlocking your next-level performance. Be ready for whatever the mountain throws at you and check out our favourite Trail gear today.