Article by John Tribbia
Inov8 Trailfly Professional (£165 | $195 | €170))
Introduction
John: Inov8’s historical past is rooted within the moist, steep fells of the UK Lakes District. For years, their id was constructed round low-profile, agency, hyper-aggressive footwear that saved your toes low to the bottom and locked onto moist rock and dust.
The Trailfly Professional is Inov8’s trendy tackle a light-weight path racer. As a substitute of maintaining issues minimal and agency, they paired a 34mm heel stack with a supercritical TPEE midsole whereas maintaining the general bundle gentle at 8.1oz / 230g (US M9.0). It’s designed to carry excessive vitality return and luxury to technical trails with out feeling ungrounded or cumbersome.
Execs:
Energetic, springy TPEE midsole JohnExtremely light-weight racing construct JohnAnatomical, accommodating toe field John
Cons:
Breathability: higher runs barely heat JohnNot a lot rock safety
Stats
Pattern Weight: males’s 230g / 8.1 oz US9
Full Stack Peak: 34mm heel / 28mm forefoot.Stack Peak Beakdown: 26mm/20mm midsole | 4mm footbed | 4mm outsole lugs.Drop: 6mm.
Platform Width 82.55mm heel / 63.5mm midfoot / 114.3mm forefoot
Launch date: Late August 2026 (UK) | September/October 2026 (US & ROW)
Tester Profile
John Tribbia (5′ 6″, 130lbs) is a former sponsored mountain/path runner who has run with La Sportiva, Brooks/Fleet Toes, Pearl Izumi, and Salomon. Regardless that he competes much less often today, you possibly can nonetheless discover John having fun with the day by day grind of operating on any floor, although his favourite terrain is 30-40% grade climbs. He has received races reminiscent of America’s Uphill, Imogene Cross Run, and the US Skyrunner Vertical Kilometer Collection; and he is held a number of FKTs on a number of iconic mountains in Boulder, Colorado and Salt Lake Metropolis, Utah. In case you observe him on Strava, you will discover he runs at various paces between 5 minutes/mile to 12 minutes/mile earlier than the break of daybreak virtually daily.
First Impressions, Match and Higher
John: Regardless of its pretty substantial 34mm / 28mm stack peak, the Trailfly Professional feels surprisingly light-weight in hand and on the size isa mere 230g / 8.1 oz US9. Its semi-translucent ripstop higher appears stripped-down but stays extremely practical.
The second you step in, the footbed and midsole present an instantly noticeable squish, because of the energetic TPEE foam that units it other than conventional agency EVA options. Proper out of the field, the shoe has a mushy, full of life experience, but the 6mm drop and platform shaping preserve you feeling securely linked to the bottom.
Inov8 makes use of what they name their NATURALFIT final. The model claims this design holds the midfoot securely whereas giving the toes room to splay naturally to enhance stability and foot well being over lengthy distances. On the path, the single-layer ripstop polyester higher is skinny and non-absorbent. It holds the foot nicely with out including weight or absorbing moisture. I did discover it much less breathable, particularly on heat muggy days although.
The 3D-printed overlays across the midfoot give sufficient lateral construction to maintain your foot from sliding off the footbed when slicing throughout steep, off-camber terrain.
Within the heel, Inov8 makes use of a patent-pending off-set heel collar. Inov8 says this design individually frames the lateral and medial ankle bones to match their anatomical heights fairly than utilizing a symmetrical collar line. Out operating, the collar sits cleanly across the ankle with out rubbing.
Mixed with a flippantly padded velocity tongue and notched laces (my favourite kind of lace), midfoot lockdown is strong and does not loosen up over lengthy efforts.
Midsole & Platform
John: The POWERFLOW ELITE midsole is INOV8’s newest of their path foam platform, which is supercritical and nitrogen-infused, and is engineered for improved vitality return. INOV8 says this foam is their most energetic ever, and the stack numbers affirm a contemporary profile: 34mm heel / 28mm forefoot with a 6mm drop. The whole stack breaks down right into a 26mm/20mm midsole core, a 4mm BOOMERANG LITE footbed (additionally supercritical TPEE), and 4mm outsole lugs.
It’s price being clear about how the froth really feels, as a result of “TPEE” will get utilized throughout a spread of path footwear and the experience character varies. This isn’t a mushy or plush midsole like a max-cushion street shoe. It’s cushioned and protecting, however the compound stays comparatively agency and full of life all through its compression cycle.
I prefer it. There’s a fast rebound fairly than a sluggish, deep sink. On rocky terrain it absorbs affect nicely with out the disconnected feeling that thick foam produces. What I actually get pleasure from is that you just nonetheless really feel what you’re standing on, however the accrued punishment from repeated rock contact over the miles is noticeably diminished in comparison with lower-stack choices I’ve run in the identical terrain.
The rocker geometry has heel flare beginning at 20% of whole shoe size and forefoot rocker at 60%. On flat street and dust sections, the shoe transitions easily heel-to-toe with out the marginally abrupt really feel I generally discover in higher-drop path footwear on pavement.
On uphills, the snappy forefoot enables you to load the foot naturally, although as a result of there isn’t a inflexible plate to lean on, your foot mechanics do need to work a bit tougher on steep grades. I feel the latter makes the shoe really feel runnable on nearly any grade.
Platform stability for a impartial shoe at this stack peak is best than I anticipated. The broader forefoot base supplies a grounded touchdown floor, and the midsole sidewalls have sufficient construction to withstand significant lateral roll on off-camber sections.
I pushed by way of intentionally unstable terrain together with angled rock slabs, free scree edges, and uncovered roots. I by no means felt the shoe escaping sideways in a manner that required aware compensation. Runners with vital overpronation or weak ankles would possibly need to look elsewhere, however for impartial runners wanting an brisk, non-plated platform, it’s strong.
Outsole
John: The G-GRIP outsole is INOV8’s traditional system infused with Graphene, which is engineered for improved sturdiness and wet-rock traction. INOV8 says the partial rubber building and deep cutaways enable the shoe to flex and intuitively adapt, and my testing confirmed a extremely pliable platform. The configuration consists of 4mm chevron-shaped lugs, with the entrance lugs angled for climbing chew and the rear lugs oriented for downhill braking.
On technical terrain, the flexibleness of this cut up outsole is improbable. My foot was capable of wrap over rocks fairly than slipping off them. Nonetheless, it’s price being clear concerning the lug format. The chevrons are fairly tightly packed collectively. The cut up outsole gives improbable flexibility on technical terrain, permitting my foot to wrap over rocks as a substitute of slipping off them. Nonetheless, the chevrons are packed fairly tightly collectively. In free, deep scree or talus, their chew wasn’t fairly as clear because the aggressive, broadly spaced lugs seen on older Inov8s that I’ve run..
Moreover, whereas the G-GRIP rubber is exceptionally sticky, this system (designed to be lighter and tackier) confirmed some minor micro-wear and early chewing on the lug edges after a number of runs on abrasive Colorado rock. It’s nonetheless a extremely sturdy choice so far as I can inform to date.
Trip
John: I took the Trailfly Professional on a combined loop transitioning from easy gravel paths to rocky, technical terrain. On flat street and dust sections, the shoe transitions easily and shortly. The light-weight design undoubtedly retains the legs feeling contemporary and quick.
In steep and technical singletrack, the shoe’s pure operating design actually works. With out a stiff carbon plate to struggle, my foot was capable of flex naturally over obstacles. The POWERFLOW ELITE TPEE foam does a very good job of absorbing sharp rock impacts underfoot, but the shoe’s average platform by no means made me really feel unstable. On steep, off-camber descents, the locked-in midfoot saved my toes utterly secure and I appreciated the exact foot placement.
Conclusion and Suggestions
John: My testing coated roughly a ten/90 cut up between pavement and path, with the dust starting from quick, flat gravel paths to steep, rocky singletrack with loads of off-camber root sections.
At simple, rolling paces (9 to 10 min/mile), the shoe is bouncy and pleasant. The POWERFLOW ELITE TPEE absorbs the affect cleanly, the higher holds the midfoot securely, and the shoe does its job with out feeling heavy or clumsy. Push into average paces (7:30 to eight:30 per mile on combined terrain) and the platform responds. The froth retains its spring, the transition feels easy.
I did a 6 mile ~3,000 ft. elevation acquire loop that goes up a steep, rocky path to Bear Peak, and finishes on quick dust and fireplace roads. The shoe dealt with the steep climbing and quick flats so simply that I forgot I used to be carrying a unique shoe than my norm. On the flatter fireplace street sections again to the beginning, the snappy TPEE rebound and the absence of a inflexible plate let me open up my stride with out preventing the shoe’s geometry. For tempo work on rolling singletrack, it’s exceptionally succesful. The place the shoe hits its restrict is on free, deep scree.
That mentioned, regardless that I don’t have a ton of expertise with Inov8, the Trailfly Professional is the perfect model of a path racer they’ve constructed up to now based mostly on the sooner comparisons I’ve had (in my humble opinion). The transition to a supercritical TPEE midsole is not only a advertising and marketing gimmick. The shoe delivers on its high-performance promise extra convincingly than another Inov8 mannequin I’ve run in.
At $195, the value is premium, however the high quality of the TPEE foam and the general building are exceptionally excessive. This shoe is for the runner who needs a quick and responsive shoe for rolling on combined singletrack, fireplace roads, and occasional rocky sections the place you need to transfer shortly however nonetheless want deep cushion. It isn’t for the runner who primarily navigates deep, sloppy bathroom mud, wants a maximum-stack rock defend, or prefers a very inflexible, plated experience.
Inov8 famous at TRE that the shoe was developed particularly for 50K-distance racing, with occasions like OCC at UTMB in thoughts. The match and geometry really feel like they have been formed by somebody who really runs technical terrain at tempo.
John’s Rating: 9.05 / 10
Trip (30%): 9.5 (actually enjoyable and poppy!)
Match (30%): 9 (safe lock down)
Worth (10%): 9 (nice on a regular basis shoe with respectable versatility)
Type (5%): 8.5 (sort of a nitpick, however I really feel like the brand throughout the shoe may use some white distinction to make the shoe pop just a little extra off the dusty brown colorway)
Traction (15%): 8.8 (succesful in quite a lot of terrain)
Rock Safety (10%): 8.5 (good for buffed path, however undoubtedly decrease finish of safety with out toe bumper and footplate. Tradeoff is a extremely quick shoe).
Smiles: 😊😊😊😊😊
3 Comparisons
Adidas Terrex Agravic Velocity 2 (RTR Assessment)
John: Each the Agravic Velocity 2 and the Trailfly Professional are light-weight, non-plated racers that includes premium supercritical foams (Lightstrike Professional vs. POWERFLOW ELITE) paired with top-tier sticky rubber outsoles. The Agravic Velocity 2 feels barely decrease to the bottom and extra conventional in its experience, delivering a snappier, firmer pop by way of its dual-layer midsole. Nonetheless, the true distinction is the match. Whereas the Adidas has a slim, locked-in race-day wrap, the Trailfly Professional’s NATURALFIT final is a a lot wider, extra anatomical toe field that lets your toes splay comfortably over longer distances.
Hoka Zinal 3 (RTR Assessment)
John: The Hoka Zinal 3 is a light-weight, nimble quick shoe constructed for race kind efforts on technical terrain, using a full-length, supercritical EVA midsole that has an brisk experience. At 31mm/26mm (5mm drop), the Zinal 3 is barely decrease and lighter than the Trailfly Professional, which provides it just a little extra agility on brief, winding singletrack. Whereas the Zinal 3’s 5mm lug sample has a deeper chew in free dust and dust than the Trailfly Professional, the G-GRIP Graphene compound on the INOV8 is far more predictable on slick rock.
La Sportiva Prodigio 2 (RTR Assessment)
John: The Prodigio 2 and the Trailfly Professional share an identical stack and drop geometries. Whereas each use nitrogen-infused foams, the Trailfly Professional has a considerably springier, higher-rebound experience and is lighter. The Prodigio 2 leans extra towards a structured, protecting ultra-marathon with its inner FlowFilm rock safety, whereas the Trailfly Professional has a extra pure flexibility and a better connection to the bottom.
Launch date: Late August 2026 (UK) | September/October 2026 (US & ROW)
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