Trail running poles have moved from niche equipment to a mainstream tool for long-distance runners, fast hikers, and mountain racers. Among the most talked-about models in this space are the Leki Ultratrail FX.One Poles. Designed in close collaboration with elite ultrarunners, these poles promise minimal weight, fast deployment, and reliable support over demanding terrain.
Design Philosophy and First Impressions
The Ultratrail FX.One poles are clearly built with one goal in mind: efficiency during long trail runs. From the moment they are unfolded, the emphasis on simplicity and speed is obvious. There are no adjustable sections, no excess hardware, and no unnecessary complexity.
The fixed-length design keeps weight down and removes potential failure points. This also signals that these poles are aimed squarely at runners who know their preferred pole length and prioritise performance over versatility.
Visually, the poles are sleek and purposeful. The matte carbon shafts, minimal branding, and streamlined grips give them a clean, technical look that matches their intended use.
Weight and Packability
Weight is one of the strongest selling points of the Leki Ultratrail FX.One poles. At roughly 179 grams per pole, they sit among the lightest full-length trail running poles available. On long climbs or extended races, that difference is noticeable, especially when poles are carried rather than planted.
The folding mechanism allows the poles to collapse into a compact bundle. When folded, they fit comfortably into most trail running vests, rear pole quivers, or belt systems. The folded length is short enough that they do not bounce excessively or snag when moving through narrow trails.
Deployment is quick and intuitive. A simple pull on the grip engages the internal cord system, snapping the pole into a rigid, locked position. Folding them away is just as fast, making transitions smooth during races where terrain changes frequently.
Shaft Construction and Stiffness
The poles use high-modulus carbon fibre shafts, which balance low weight with impressive stiffness. On steep climbs, they provide solid power transfer without the spongy feel that can affect cheaper carbon or aluminium designs.
There is minimal flex under load, even when pushing hard uphill or stabilising during descents. This stiffness helps reduce wasted energy and gives confidence on technical terrain, where precise placement matters.
Carbon fibre does come with trade-offs. While strong, it can be more vulnerable to sudden impacts against sharp rocks. These poles feel robust for their weight, but they are not designed to be abused or used as all-purpose trekking poles.
Grip Design and Comfort
One of the standout features of the Ultratrail FX.One poles is the grip. Leki uses their Trigger Shark system, paired with a lightweight cork-like grip material.
The grip shape is ergonomic and works well with both bare hands and thin gloves. The material offers good moisture management, maintaining grip even when hands are sweaty or conditions are wet.
The Trigger Shark system allows the strap to clip directly into the grip. This creates a secure connection that improves control and reduces the need to grip tightly, which helps limit hand fatigue over long distances.
Strap System and Hand Feel
The Shark Frame Strap Mesh is designed specifically for trail running. It wraps comfortably around the hand without feeling bulky or restrictive. Once adjusted, it stays in place and distributes pressure evenly.
Clipping in and out is quick and intuitive. This is particularly useful during technical sections where poles need to be stowed briefly or when hands need to be free for scrambling.
Some people may prefer traditional loop straps, but the Shark system offers a more connected feel and encourages efficient pole use. Over long runs, this can make a noticeable difference to comfort and energy conservation.
Tip Performance and Terrain Adaptability
The Ultratrail FX.One poles come with lightweight trail running tips designed for mixed terrain. On dirt, gravel, and hard-packed trails, they provide reliable traction without excessive vibration.
On rocky surfaces, the tips offer good precision, though they are not as forgiving as rubber trekking tips. For runners who frequently encounter pavement or very hard ground, the sharper feel may take some adjustment.
The poles are best suited to natural trail environments rather than urban or road-heavy routes. In their intended setting, they feel responsive and predictable.
Fixed Length: Strength and Limitation
The fixed-length design is both a strength and a limitation. By removing adjustment mechanisms, Leki reduces weight and increases reliability. There is no risk of sections slipping under load, and the pole always feels solid.
However, choosing the correct length is critical. Unlike adjustable poles, there is no margin for error. Runners need to select the right size based on height and personal preference.
For those who already know their ideal pole length, this is not an issue. For others, especially people new to trail running poles, it may require careful consideration or testing before purchase.
Performance on Climbs
On sustained climbs, the Ultratrail FX.One poles excel. Their low swing weight and stiffness make them easy to plant quickly and rhythmically. They encourage an efficient uphill cadence and reduce strain on the legs.
The grip and strap combination allows power to be transferred through the arms and upper body without excessive hand tension. Over long ascents, this can help preserve energy and maintain form.
The poles feel particularly well suited to steep, runnable climbs where speed and efficiency matter more than raw support.
Stability on Descents
While trail running poles are often associated with climbing, they can also add stability on descents. The Ultratrail FX.One poles offer precise placement and quick recovery, which helps with balance on technical downhill sections.
Their light weight makes them easy to lift and reposition quickly, avoiding the sluggish feel that heavier poles can introduce. That said, they are not designed for heavy braking or leaning hard into the poles on descents.
For controlled, agile running downhill, they perform well. For slow, heavily loaded descents, a more robust trekking pole may feel more reassuring.
Durability and Long-Term Use
Durability is always a concern with ultralight carbon equipment. In normal trail running use, the Ultratrail FX.One poles hold up well. The joints, cord system, and grip attachment all feel well engineered.
Repeated folding and unfolding does not introduce noticeable play or looseness. The locking mechanism remains secure, even after extended use.
However, they demand a degree of care. Direct side impacts, crushing forces, or improper storage could shorten their lifespan. These poles reward mindful use rather than rough handling.
Comparison to Adjustable Alternatives
Compared to adjustable trail running poles, the Ultratrail FX.One model prioritises speed and weight savings over versatility. Adjustable poles offer flexibility for different terrains, packs, and activities, but they usually weigh more and involve more moving parts.
For racing, fast training runs, and technical trails where quick deployment matters, the fixed-length design is a clear advantage. For people who want one pole for hiking, travel, and varied conditions, an adjustable option may be more practical.
Value for Money
The Leki Ultratrail FX.One poles sit at the premium end of the market. The price reflects the lightweight materials, refined design, and brand reputation.
For dedicated trail runners and ultrarunners, the performance benefits can justify the cost. The weight savings, comfort, and reliability add up over long distances.
For occasional use or casual trail outings, the investment may feel harder to justify. These poles are specialised tools rather than general-purpose equipment.
Who These Poles Are Best Suited For
The Ultratrail FX.One poles are ideal for experienced trail runners, ultrarunners, and mountain racers who value efficiency and minimal weight. They suit people who already understand how to use poles effectively and know their preferred length.
They are less suitable for beginners, people who want adjustability, or those looking for a single pole to cover many outdoor activities.
Final Thoughts
The Leki Ultratrail FX.One Poles deliver exactly what they promise: lightweight, fast, and efficient support for long-distance trail running. They strip away unnecessary features and focus on performance where it matters most.
Their stiffness, grip comfort, and rapid deployment make them a strong choice for competitive and serious runners. While the fixed length and premium price limit their appeal for some, those who fit their intended profile are likely to appreciate their precision and reliability.
These are poles designed for movement, rhythm, and endurance, not compromise. Used as intended, they become an extension of the runner rather than a piece of equipment that needs constant attention.
