Mountain running is what you get when you crank up the dial on trail running, but that doesn’t mean there isn’t plenty of kilometres on trail and time spent power hiking. At its core, mountain running is broader than trail running in the fact that it doesn’t require a trail at all, and “mountain” can apply to everything from rolling singletrack to the most demanding, remote peaks. It’s untethered, although it does sometimes require a harness and a rope if you’re moving through glaciated terrain or routes that require rock climbing or rappelling. It’s technical, it’s specialized, and it’s fast and light.

Because of the nature of where mountain running often takes you (high-consequence terrain via cross-country travel), and how you’re getting there (with a fast and light style), it requires durable gear that punches well above its weight. Shaving ounces off your mountain running kit adds up over a 16-hour day on foot, but not having the right gear can end your day. To meet the high demands of mountain running, Arc’teryx gear emphasizes strength-to-weight ratios, lightweight fabrications, reliable waterproofing and wind-resistance, and packability, striking the balance between being prepared and staying light.

What are the essentials for mountain running?

Because of the technical terrain and variable conditions often encountered during mountain running, a 10-20 litre running pack with a vest can hold extra layers, nutrition, emergency gear, and water. Durable trail running shoes with pronounced lugs and a grippy sole are critical — even better if they are crampon-compatible. One lightweight, waterproof and wind-resistant shell and/or insulated jacket is essential for most routes. If the route is glaciated or requires climbing or rappelling, crampons, a helmet, an ultralight harness, and a 30-40 metre rope could be essential.

Should I wear leggings or pants for mountain running?

For most mountain runners, shorts are preferred for most objectives. They are the most lightweight option and offer ultimate freedom of movement. However, if conditions are colder or you need an additional layer for overnight or sudden changes in weather, choosing leggings or pants is a matter of personal preference. Often, leggings pack down smaller and are lighter in weight, making them ideal for offering protection without adding much weight to your overall kit. However, some mountain runners prefer technical pants for their looser fit and easy on-and-off over shorts. Ultimately, the choice is yours.