The INOV8 Trailtalon Zero is a bit of a Swiss Army knife. With 6 mm lugs, you’d think it’d be happiest on soft muddy-goodness, and you’d be right. But that G-GRIP graphene-enhanced outsole grips well on pretty much anything — wet rock, hardpack, even the odd stretch of tarmac (if you’re unlucky enough to hit one). It’s taken me a while to get round to testing INOV8. Their low-stacked midsoles and firm ride have always felt worlds apart from the soft, bouncy super-foam shoes I tend to live in. But after putting some miles into the Trailtalon Zero, I’ve started to see the appeal. INOV8’s whole “neither over- nor under-engineered” thing isn’t marketing fluff. It’s the real deal. In this review, we’ll explore why the Trailtalon Zero proves that INOV8’s refusal to bow to the latest trends is the right call. Their old-school, “nature knows best” approach still works — so why change it?

Specs/Tech Breakdown

Drop: 0mm
Lug Depth: 6mm
Midsole: FLYSPEED Pro EVA foam
Stack Height: 12mm/12mm (midsole only); 25.5mm/25.5mm (outsole + midsole + insole)
Plate: META-PLATE (rock plate)
Fit: Available in standard and wide
Intended Terrain: Soft, muddy, mixed trails

INOV8: Built for the Bog, Not the Bandwagon

If you’ve been following for a while, you’ll know my flavour: soft, chunky shoes. If they’re packing an energetic PEBA or TPE-based foam — even better. INOV8’s lineup isn’t exactly known for those things. In fact, their shoes are the complete antithesis. They’re firm, low to the ground, and still powered by supercritical EVA.

If it sounds like I’m giving INOV8 stick, I’m not. There’s a reason so many professional trail and ultra runners — as well as us common folk — reach for the brand. And in the case of the pros, it’s not just about contracts. Jasmin Paris, for instance, was an INOV8 athlete when she shattered the record at The Spine — one of the UK’s toughest endurance races. But when she became the first and only woman to finish The Barkley Marathons, she was no longer sponsored. She still laced up a pair of INOV8s.

INOV8, as they put it, were “forged in the fells and mountains of the English Lake District.” That might not mean much to readers across the pond, but here’s the short version: it’s spectacularly beautiful — and utterly miserable, weather-wise. The lush green landscape owes its beauty to the endless rain. So if anyone knows how to design kit that not only survives but thrives in the worst conditions, it’s INOV8. If they were on Mastermind, that’d be their specialist subject.

While some brands try to tame nature by over-engineering their shoes, INOV8 operate on the belief that nature knows best. They neither over- nor under-engineer — instead aiming for balance with the elements. It’s that principle that’s kept them from chasing trends. No springboard foams. No carbon plates. And even the recent ‘Max’ versions of their classics — from the Trailtalon Max to the Roadfly Max — stay true to form: max in name, moderate in everything else.

So why has it taken me so long to try a pair of INOV8s? Honestly — I’ve always had a soft spot for the over-engineered, over-the-top kind of shoe. The bigger the stack, the better. Throw in a few “speed-enhancing” technologies — most of which I’ll never be fast enough to really make use of — and I’m sold.

But when I made the switch to trails, all that changed. I quickly discovered that superfoams and carbon-fibre plates were less effective unless the trails you ran were, well, basically roads. It was the same story for big stacks: great for ultra-distance events on well-groomed paths, but potentially dangerous elsewhere.

The problem was, my body had grown used to that pillowy goodness. I couldn’t just do a 180 and expect no consequences. Worried my feet wouldn’t have the strength or stability to handle the switch, I decided to play it safe — hunting for trail shoes that offered reasonable, but not over-the-top, cushion. And for the longest time, INOV8 just didn’t fit that description.

I remember one of the first times I browsed INOV8’s website. I was genuinely shocked to find that most — if not all — of their forefoot (and many heel) stack heights started with a 1. In other words, many of the midsoles were under 2 cm thick. In the case of the Trailtalon Zero, that’s 12/12 mm. Coming from shoes that had been deemed illegal for use in competitions because of their monstrously tall stacks, INOV8’s lineup may as well have been huaraches.

Then came the Trailfly Max. They looked chunky — just how I like it — and gave me a chance to put G-GRIP up against ol’ trusty Vibram Megagrip. Ironically, and in a rather amusing turn of events, while I enjoyed the Trailfly Max, I couldn’t help but think: these would probably feel better with less stack. I know, I know — I can’t believe I’m saying it either. But that’s how we’ve ended up here, testing the Trailtalon Zero.

The Trailtalon Zero and Trailfly Zero share much of the same DNA. Both use FLYSPEED Pro midsoles and share the same 12/12 mm stack height (more on that later). Both feature INOV8’s BOOMERANG insole — hundreds of TPU foam beads that compress underfoot and, according to INOV8, deliver “40 % energy return with each stride.” And, as their names suggest, both are zero-drop — meaning the heel and forefoot sit at the same height.

The key differences are found underneath. While both use the same G-GRIP graphene-enhanced compound, the Trailtalon Zero carries 6 mm lugs for softer ground; the Trailfly Zero 4 mm for the hard stuff. Naturally, their lug patterns differ too. The Trailfly uses angled studs that face multiple directions to improve grip, shed debris, and brake at the heel. The Trailtalon, meanwhile — and this is something I really like — features lugs shaped, and I quote, “like the hoof pattern of a mountain goat.”

But does this really make the Trailtalon Zero the G.O.A.T on mountainous terrain?

INOV8 Trailtalon Zero Stack Height

I’ve spoken at length about INOV8’s modest stack heights. Truthfully, though, they’re not quite as minimal as they might first appear. They’re still not going to get you disqualified from competition (should any professional athletes be reading this), but they’re not the oxymoronic barefoot-style shoes I once assumed they were.

Somewhat embarrassingly, I only realised this after buying the Trailfly Max. In the flesh, they look every bit the max-cushioned trainer. On paper, though, the official figures tell a different story — just 24 mm in the heel and 18 mm in the forefoot.

As it turns out, INOV8’s listed measurements refer only to the midsole stack. In hindsight, the clue’s in the wording on their spec tables. Most brands quote a total stack height — combining outsole, midsole, and insole — so it’s easy to assume INOV8’s numbers mean the same. In fairness, I actually think their approach is refreshingly transparent. It lets you see exactly how much of the shoe’s height is true cushioning rather than rubber or footbed.

That said, it would be nice to see the total stack height shown alongside these figures, with a simple breakdown of where the numbers come from. You can find that info — if you dig through the “Run” section and “Shop by Range” filters — but it feels like a small copy-and-paste job away from being properly clear.

INOV8 Trailtalon Zero Sizing and Fit

In 2024, INOV8 overhauled the design and fit of their footwear with the introduction of NATURALFIT — a concept aimed at letting the shoe move with the foot, not against it. As INOV8 founder Wayne Edy puts it:

“Our new design and fit ensures the foot controls the shoe, not the other way round. It’s as nature intended.”

NATURALFIT locks in at the heel and midfoot for control, then widens at the toes to allow them to splay, land, and push off naturally. There are three width options across the range: Precision, Standard, and Wide. For the Trailtalon Zero — and all of INOV8’s trail models (fell is a separate category) — you’re limited to Standard or Wide.

• Precision — the narrowest fit, designed primarily for fell and off-trail shoes.
• Standard — INOV8’s most common toe box. It sits between Precision and Wide, with a slightly more anatomical shape. Not as roomy as Altra or Topo Athletic, but noticeably more natural than many brands.
• Wide — the most spacious option, offering extra comfort and space upfront for broader feet.

When it comes to sizing, I’d recommend going with your usual running size (for me, that’s half a size up from street). If they feel a little snug, try the wide fit rather than adding unnecessary length up top.

INOV8 Trailtalon Zero: FLYSPEED PRO — Same Old INOV8?

The FLYSPEED PRO midsole — all 12 mm of it — is made from supercritical (nitrogen-infused) EVA. INOV8 have long favoured firmer midsoles, but this one hits a sweet spot. It’s soft enough to take the sting out of hard terrain, yet firm and responsive enough to stay lively and composed on softer ground.

Any softer, and it’d wallow in mud. Any firmer, and hard terrain would start to feel like punishment. As it stands, the FLYSPEED PRO offers just the right balance — protective, responsive, and versatile.

That being said, if your focus is technical rocky terrain, there are better tools for the job. While it’s versatile enough to handle the odd stretch, you wouldn’t want to stay on it for long. The lugs are too deep, and the G-GRIP rubber too firm to deliver true long-haul comfort over sharp surfaces. If that’s your bag, the Trailfly Zero or Trailfly Max — which share the same midsole compound but use shallower lugs patterned with the hard stuff in mind — make for a smoother, more forgiving ride.

But after testing the Trailtalon Zero on the varied terrain of the Peak District — a real mix of rock-laden edges, well-groomed paths, grass, and mud — it’s safe to say that the Trailtalon Zero really is a do-it-all shoe. They’ve handled everything I’ve thrown at them without a hitch. I’ve never finished a run wishing I’d worn something else — and that says a lot. Sure, I have better options for the rockier sections. But these would struggle on the soft, wet, and muddy parts. The Trailtalon Zero manages to strike an effective middle ground, maintaining both comfort and performance on all terrain.

It’s on softer ground, though, that the Trailtalon truly shines. Here, INOV8’s decision to stick with supercritical EVA — and resist stacking it sky-high — makes perfect sense. Soft terrain provides natural cushioning, so adding more foam would be redundant. The lower stack keeps you close to the ground, delivering stability and control, and encouraging you to open up the pace when the conditions allow.

While supercritical EVA doesn’t have the rebound of PEBA or TPE foams, it’s a deliberate choice. On soft, uneven terrain, higher-rebound foams compress too much and return too little. You end up fighting the shoe for momentum. EVA, by contrast, holds its shape, transfers energy efficiently, and offers better durability — a key point for a brand that builds shoes to survive copious amounts of abuse and not just one racing season.

INOV8 often talk about avoiding both over- and under-engineering, and this midsole sums that up perfectly. It’s simple, purposeful, and effective — proof that restraint can be a performance feature in itself.

INOV8 BOOMERANG Insole: TPU Comfort & Performance

The BOOMERANG is INOV8’s flagship insole — comfortable, shock-absorbing, and, according to INOV8, capable of up to 40% energy return with each stride. That’s thanks to the hundreds of TPU foam beads that compress and rebound on impact. It’s reminiscent of the one found in Norda’s shoes — only you don’t need to remortgage your house for the INOV8 experience.

It accounts for (I believe) 7.5 mm of the Trailtalon’s 25.5 mm total stack height — a surprisingly chunky and idiosyncratic approach to bolstering stack height. Still, I’ve got no complaints about it. It’s thick without stealing vertical space or cramping the fit, and it really is insanely comfortable. The only thing I’ll say is it looks suspiciously like a slice of tempeh (Google it if you don’t know what I’m on about). And after all the miles I’ve logged in them, I imagine it wouldn’t taste much different either.

Before any of my vegan readers start sharpening their sporks — I’m kidding. The insole’s likely got far more flavour. I’m mostly plant-based myself, and tempeh’s a staple in our house. What this has to do with trail running shoes, I’ve no idea. But there you go.

INOV8 Outsole: Let it Rip with G-GRIP

When it comes to grip, the gold standard in my eyes has always been Vibram Megagrip. I spent years climbing in various formulations of Vibram’s sticky rubber, so I know it’s dependable. And since swapping tarmac for trail, it’s all I’ve ever known. Still, despite both experience and reputation, it took time before I fully trusted Megagrip — before I felt confident enough to go all in. With one spinal injury and a fusion surgery under my belt, I wasn’t exactly eager to add another.

I approached the relative unknown of INOV8’s G-GRIP with the same hesitation. But it didn’t take long to build confidence. Before long, I was charging down descents — or at least, my version of “charging.”

On soft ground, the Trailtalon’s 6 mm lugs come into their own — biting deep and giving a secure, predictable platform to push from. It’s a similar story when it comes to sections of loose scree. In fact, despite a substantial amount of bounding between rocks, only one occasion comes to mind where the Trailtalon Zero failed to grip. That came after running through a wet, muddy patch, so I assume a few bits had failed to shed before stepping onto the rock.

INOV8 describe the Trailtalon as an all-terrain shoe offering traction on everything from mud and soft trail to hard ground. That’s a fair summary. In my testing, G-GRIP felt every bit as dependable as Vibram Megagrip — though there are some key differences worth noting.

Megagrip is a softer, stickier compound, which gives it the edge on rock. In dry conditions, you’ll struggle to tell them apart, but once things get slick, Megagrip holds a slight advantage. That’s not to say G-GRIP performs poorly — far from it — but if your routes are dominated by wet, rocky terrain, Vibram probably still takes the crown.

The trade-off, of course, is durability. Megagrip’s softer rubber wears faster, whereas the graphene-enhanced G-GRIP compound is tougher than nails. On most INOV8 shoes, the outsole will likely outlast the upper and midsole — the opposite of what you tend to see with Vibram-equipped models. It’s worth stressing, though, that grip and longevity aren’t determined by the type of rubber alone. Lug pattern, depth, and spacing all play huge roles, making direct comparisons tricky.

What this further means is simple: just because a shoe runs Vibram Megagrip doesn’t make it a good shoe. A brand can slap on sticky rubber yet ruin its potential with a poor lug design — spacing, shape, depth, angle — any of that can cripple performance. INOV8, however, hold both cards: they engineer the lug geometry and develop the G-GRIP compound. That level of control gives them an advantage. While nothing’s perfect, you’re far less likely to see INOV8 shoes miss the mark on their intended terrain.

INOV8 Trailtalon Review: Gritty Runner Verdict

Coming into this, I wasn’t sure whether I’d see eye to eye with the Trailtalon Zero. While the total stack height sits around 25.5 mm front and back, more than half of that comes from the Boomerang TPU insole and G-GRIP outsole with its 6 mm lugs. That leaves just 12 mm for the FLYSPEED PRO midsole — hardly Hoka Mafate X territory.

It’s not that I’m unfamiliar with low stacks these days. I’ve logged countless miles in the Altra Lone Peak 9+, even more in the NNormal Kjerag 02, and a fair amount in Norda’s 002. But the Trailtalon Zero has the deepest lugs of the lot. My main concern was that there wouldn’t be enough midsole — or that it’d be too firm — to dampen the bite of the G-GRIP outsole on the harder sections of mixed terrain I often run. I needn’t have worried. INOV8’s description of the Trailtalon Zero as an all-terrain, Swiss Army knife-style shoe capable across multiple surfaces is spot-on.

Traction is excellent, and that thin layer of supercritical EVA is perfectly judged. It cushions just enough on mixed terrain — from soft ground and mud to hard-packed trails. And while it’s not built for prolonged rock-hopping through boulder fields, it doesn’t feel out of place there either.

After months with the Trailtalon Zero, I finally understand why so many runners — elites and everyday alike — stick with INOV8. I’d avoided them for years because they lacked the fancy tech I’d grown used to. After thousands of kilometres in soft, propulsive, max-cushion trainers, I assumed my feet had become too pampered. Turns out, INOV8’s low-to-the-ground design delivers something I’d been missing: genuine connection. There’s more ground feel, more control, and ultimately, a more natural and fun experience — the kind of running where you stop thinking and just move.

When I first decided to test INOV8, I started with the Trailfly Max — something that felt familiar. And while I’m still a fan, I couldn’t shake the feeling that the extra midsole dulled, rather than enhanced, the ride. After running in the Trailtalon Zero, I can confidently say I’m a convert to the lower-stack approach.

It’s taken a while to get this review out (deepest apologies if you’re reading, Lee!) — thanks to an untimely illness that sidelined me for a month, and a stretch of suspiciously good weather that made deep lugs feel redundant — but I’m itching to try either the Trailfly Zero, regular Trailfly, or Trailfly Speed next. Hopefully INOV8, who were kind enough to gift this pair of Trailtalon Zeros, will be able to make that happen. And Lee, if you are reading, just one last thing.. next time, let’s keep away from any red-coloured shoes. While it may be a known fact that red shoes are the fastest, my favourite anti-blister socks from Runderwear are white, and as a die-hard Sheffield Wednesday fan, that colour combo feels sacrilegious. I’d rather go slow.

All in all, if you’re on the fence about trying INOV8 and their G-GRIP rubber, take it from me — you might just be pleasantly surprised.

Other Articles You Might Be Interested In

If after this lengthy piece you’ve still not got your fix of trail running-goodness, why not check out some of our other articles. Oh, and if you just want to browse gear, you’ll find a plethora of discount codes at the bottom of this page.

• If you’re in need of some high-quality trail running equipment that doesn’t break the bank, Harrier’s our top choice. You’ll also find an exclusive discount for Gritty Runners’ readers.
• See which trail running shoes made our best trail running shoes (2025) list and whether the Trailtalon Zero is one of them.
• If 6mm lugs aren’t enough for you, you might want to consider the INOV8 Mudtalon/Speed V2.
• So you’ve got the shoes, but what about an oft-overlooked part of every runner’s wardrobe? See what we think to Runderwear’s running underwear and socks.
• Want another low stack, zero drop option? Then how about our review of Altra’s Lone Peak 9+?
• Fancy running in shoes developed by the mountain-racing G.O.A.T, Kilian Jornet? Read our review of the NNormal Kjerag 02 and see how it compares with another technical trail racer, the Salomon S/LAB Pulsar 4.
• Looking for mandatory trail and ultra running race kit? Our best trail shoes, gear, and equipment roundup review’s got you covered.