Inov-8 Trailfly Max Review
The Inov-8 TrailFly Max is a well-cushioned, neutral trail running shoe designed for use on hard-packed tracks and trails. It is versatile enough to serve as a road-to-trail shoe while providing enough grip for softer trail sections. Like all of Inov-8’s latest models, the TrailFly Max features a broad, rounded toe box that allows your feet the space to function naturally inside the shoe. This design encourages additional cushioning, stability, and spring from your feet, ankles, and lower legs, complementing the cushioning, grip, and stability the TrailFly Max itself provides.
When the word max is used in running shoes, it often suggests extremely high stack heights (40mm or more) and very soft foams that remove ground feel and discourage natural foot function. Inov-8’s use of Max is different. Within their range, it simply indicates the greatest level of cushioning they offer. The Trailfly Max has a 24mm heel and 18mm forefoot stack, using a nitrogen-infused, supercritical EVA midsole called Flyspeed. This fusion locks in air to give bounce, while preventing dirt and water from entering, which helps the foam resist degradation. As a result, the cushioning remains consistent throughout a run, providing the same structure and responsiveness at the end as at the start.
Above the Flyspeed midsole sits Inov-8’s Boomerang Footbed. At 6mm thick and also nitrogen-infused, it adds softer step-in cushioning and increases durability. On the run, this creates a feel of soft initial impact followed by a firmer, more responsive push-off. Compared with thinner Inov-8 trail shoes, ground feel is reduced, but in exchange you gain more protection and a solid, stable underfoot ride.
The 6mm drop suits both heel and forefoot strikers. Combined with the rounded toe box, it promotes natural foot spreading, reduces heavy heel striking, and encourages a more upright posture. Unlike many modern running shoes with rockered midsoles that roll the foot through the gait cycle, the TrailFly Max requires your body to do the work. This produces a more authentic, natural ride, with better feedback on pace and fatigue—ideal for recovery runs and steady efforts.
The cushioning and outsole durability make the TrailFly Max capable on roads, too. This versatility means it can handle mixed terrain runs with ease. The outsole uses the same one-piece rubber found across the Trailfly range, made from graphene-infused sticky rubber. Graphene improves abrasion resistance and adds elasticity, allowing the sole to flex naturally with the midsole. The 4mm flat lugs enhance grip on smooth and firm ground, while still offering traction on softer surfaces, making the shoe well-suited to a typical UK summer—whether wet or dry.
Fit is another standout feature. Some runners believe trail shoes must be narrow and tight to prevent slipping on uneven terrain. Inov-8 takes a different approach. The heel cup is flexible and pulls snug around the heel when laced, while overlays secure the midfoot. The forefoot remains broad to allow natural spreading, which actually helps reduce sliding when descending or contouring. Once accustomed to this roomy design, most runners find their feet adapt and function more effectively. In testing, I found the fit secure yet comfortable. My feet could spread and wiggle without any unwanted movement, even on technical ground. The heel, cuff, and tongue are softly padded for comfort without excess bulk, and the tongue is partially gusseted with a lace tab to hold it in place. An extra lace hole is included for a snugger heel fit or butterfly lacing.
The TrailFly Max is offered in two widths: Standard (roomier than many narrow-fitting brands) and Wide (similar to most 2E fits). Inov-8’s length is comparable to Hoka, New Balance, La Sportiva, Scott, and Karhu. If you typically wear Brooks, Saucony, 361, Topo, or Altra, you may need to go half a UK size down (for example, UK 11.5 in Inov-8 fits like a UK 11 in Altra). Compared with lower-stack Inov-8 models, the Trailfly Max and Trailtalon Max are less adaptable to uneven terrain but provide more protection and comfort. This makes them particularly suitable for long training runs, ultra-distance events, and recovery days—times when underfoot protection is more important than speed. They aren’t the fastest-feeling shoes, but they are reliable and forgiving for long hours on the trail.
Summary
The Inov-8 TrailFly Max is a cushioned trail running shoe best suited for easy recovery runs, long efforts, and ultra-distance events. Its broad toe box, moderate 6mm drop, and durable Flyspeed midsole promote natural foot function while offering consistent cushioning. Designed primarily for firmer trails, it is versatile enough to handle road-to-trail routes and softer ground in moderation.
Alternatives to Inov-8 TrailFly Max
Hoka Challenger 8: A much more pointed toe box and softer ride with a rocker. These shoes do more of the running for you. Hoka make shoes to replace your feet rather than work with the body which has a very different feel to a shoe designed to allow your body to function. The traction is more suited to hard packed tracks and trails. There is little feel for the floor you are relying on the soft midsole soaking up the terrain rather than nimbly skipping over obstacles. Available in two width men’s and women’s. https://www.northernrunner.com/blog/hoka-challenger-8-review/
Topo Athletic MTN Racer 4: A broad rounded toe box allows a similar level of foot function. The MTN Racer has a softer ride and is more flexible. The zip foam midsole is not nitrogen infused so the midsole will get slightly softer if you are running all day which will reduce the bounce. The grip level is better on softer surfaces as the lugs are more pointed and bite better into soft ground. They aren’t as smooth on hard packed trails. https://www.northernrunner.com/blog/topo-athletic-mtn-racer-4-review/
Brooks Cascadia 19: The nitrogen infused midsole is a lot bouncier than the Inov-8 Trailfly Max. Whether this is better depends on the wearer. The bounciness doesn’t feel as natural and further takes away from the feel for the ground. The base of the Cascadia is much wider which can be an issue on single track trails. The lugs are similarly versatile. Available in two width men’s and women’s. https://www.northernrunner.com/blog/brooks-cascadia-19-review/
Inov-8 Trailtalon Max: This is essentially the same shoe as the Trailfly Max but with a different outsole. The Trailtalon Max has 6mm long lugs that are more pointed to give better traction on softer terrain. The lugs give some extra cushioning on hard packed trails which gives the Trailtalon Max a softer ride. However, the lugs don’t feel as smooth on hard packed trails. Available in two width men’s and two width women’s. https://www.northernrunner.com/blog/inov-8-trailtalon-max-review/
Altra Mont Blanc Speed: A zero drop shoe with a broad rounded toe box. The ride is faster partly due to the zero drop which reduces heel strike and partly due to the responsive foam. The traction level is similar. https://www.northernrunner.com/blog/altra-mont-blanc-speed-review/
New Balance Hierro v9: A more pointed toe box. Although it is still quite roomy. The midsole is much thicker, and the rocker is quite noticeable. The performance was better than I expected. The midsole isn’t too soft, and the rocker promotes a smooth ride that doesn’t take over your gait. However, this is a very different ride to the more natural feeling Inov-8 Trailfly Max. The Hierro v9 is available in three width men’s and two width women’s. https://www.northernrunner.com/blog/new-balance-fresh-foam-x-hierro-v9-review/
La Sportiva Prodigio Pro: These could be described as the ultimate race ready Ultra trail racing shoe. The sock like upper helps make the shoes part of your foot. The midsole is soft but, responsive and flexible enough to take the contours of the trail. The lugs are long enough to give traction on soft trails as well as hard packed trails. If you are looking for a more natural ride or a durable training shoe then this might not be the best choice but, worth considering if you want a shoe for a specific Trail Ultra. https://www.northernrunner.com/blog/la-sportiva-prodigio-pro-review/
Ronhill Freedom Ultra: A straight big toe line let the other toe’s function. The toe box isn’t as rounded but, is roomy and does allow some foot function. The midsole is nitrogen infused and has a nice bounce to it without taking away too much ground feel. So, there is more ground feel than the Trailfly Max has, and the shoes are more flexible. The outsole has a similar level of traction. https://www.northernrunner.com/blog/ronhill-freedom-ultra-review/
Topo Ultraventure 4: A broad rounded toe box and nice cushioned ride. The flat lugs that have rounded edges reduce the traction level making these only suitable to hard packed trails. They make a great road to trail shoe or mixed run shoe as they feel nice and comfortable on the tarmac. https://www.northernrunner.com/blog/topo-athletic-ultraventure-4-review/
Hoka Mafate 5: As mentioned in the section on the Hoka Challenger 8, Hoka shoes are designed to replace your feet. The Hoka Mafate 5 illustrates this well. The cushioning is very soft on impact. The rocker carrier you through the gait cycle and the forefoot PU plate gives you some propulsion. The cushioning is so good that you notice the lack of impact in your legs at the end of a long run. A very different fit and feel to the more natural Trailfly Max. The toe box is pointed but roomy. However, the soft cushioning discourages any foot function. https://www.northernrunner.com/blog/hoka-mafate-5-review/
VJ Ultra 3: A nitrogen infused midsole gives the VJ Ultra a soft cushioned ride which takes away some feel for the ground. Although only to the same level as the Trailfly Max. VJ’s trail running shoes all have a rounded toe box to encourage foot function and reduce the foot swelling on longer outings. The traction is at a similar level to the Trailfly Ultra except on wet slippery surfaces where the VJ rubber is viewer as the gold standard in traction. https://www.northernrunner.com/blog/vj-ultra-3-review/
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