Inov-8 Trailfly Max Review: 100 Miles in a Deeply Cushioned Trail Shoe

Introduction

Deeply cushioned trail shoes are everywhere right now, but few brands manage to add all that foam without losing the connection you need on uneven ground. The Inov-8 Trailfly Max is the brand’s answer, a Max version of its well-liked Trailfly with a taller stack, a new supercritical foam, and the brand’s now-signature foot-shaped fit. After around 100 miles of training runs and a few races in them, the short version is this: they lived up to expectations.

At a Glance: Key Specs and Pricing

The Trailfly Max retails for £150 in the UK, which is roughly the going rate for a deeply cushioned trail shoe. My pair in a UK 10 weighs 318g. The midsole stack measures 35mm at the heel and 29mm under the forefoot, giving a 6mm heel offset.

Colorways include blue/lime/black, black/light gray/red, and a very bright heat map option. Women’s versions come in blue gray/coral light gray or ivory/storm blue lime. Competitors sit in a similar bracket: the Asics Trabuco Max at £160, New Balance’s Fresh Foam X Hierro v9 at £140, and Merrell’s MTL Adapt Matrix at £170, so £150 feels fair for what you get.

Fit and Sizing

Since launching its new trail lineup in early 2024, Inov-8 has used a foot-shaped, anatomical design across the range. The result is a roomy toe box similar to an Altra or Topo, with a width option available on the Trailfly Max for runners who need extra room. The toe box is genuinely accommodating, giving feet space to spread out on longer runs.

Even with a relatively narrow and shallow foot shape, it was easy to get a secure lockdown in the midfoot and a good hold in the heel. One sizing note: going up at least half a size is recommended, and the UK 10 tested here worked well.

Construction and Design

The upper is deliberately simple: a lightweight, breathable engineered mesh, a padded gusseted tongue, moderate padding around the ankle collar, and a straightforward lacing system. Inov-8’s Mech Cradle overlays run from the rear of the shoe to lock in the heel and midfoot, keeping foot movement to a minimum, and a substantial toe bumper adds upfront protection alongside a heel pull tab.

The midsole is where the biggest changes live. The Trailfly Max gets the deeper stack you would expect, paired with Inov-8’s FlySpeed Pro, a supercritical nitrogen-infused EVA foam that is the brand’s highest-performing foam to date: lighter, with more comfort and energy return. The bouncy Boomerang insoles add another soft layer underfoot. On the outsole, a graphene grip compound with 4mm multidirectional lugs handles a range of terrains, and Metaflex grooves across the forefoot keep the shoe surprisingly flexible for such a cushioned platform.

Comfort and Performance

Deep cushioning on trails is a tricky balance: too soft and you lose the ground feel that keeps you stable on technical terrain. Inov-8 has struck that balance well. The foam is soft and comfortable without being overly plush, and the shoe stayed planted and connected even on more technical sections, while remaining comfortable on long stretches of firm compacted trail and tarmac.

The graphene grip outsole is a highlight, particularly in wet conditions. Grip on wet rock felt noticeably more consistent than older graphene compounds, which could grip one rock and slip on the next. The 4mm lug depth is not built for deep mud and bog, but it handled slightly muddy trails better than expected. One small annoyance: the laces are ridiculously long, needing a triple knot to stop them flapping around.

Durability

Durability has occasionally been a weak point for Inov-8 shoes, but this pair is holding up well. After close to 100 miles there is no early wear on the upper, the flex point looks good, and there is no overlay peeling. The graphene rubber is proving very durable, with only the slightest wear on the outer heel edge, which is normal for this tester. Combined with comfort and performance, the Trailfly Max scores a very strong 25 out of 30 across price, comfort and performance, and durability.

Buying Advice

If you want a cushioned, comfortable trail shoe that still feels well connected on technical trails and you like a roomy toe box, the Trailfly Max is well worth a closer look. Similar options include the Topo Ultraventure 4, with its roomy toe box, well-cushioned but not overdone midsole, and similar lug depth and heel offset, and the Brooks Caldera 8, which does a very similar job out on the trails.

Go up at least half a size if you order, and budget for the full £150 price, which is in line with direct rivals. This is a shoe for distance-focused trail runners who value versatility over a race-day aggressive feel.

Conclusion

After roughly 100 miles, the Inov-8 Trailfly Max earns its keep as a comfortable, versatile daily trail shoe that handles almost anything thrown at it. The combination of the FlySpeed Pro midsole, consistent wet-weather grip, and an accommodating foot-shaped fit makes it easy to recommend, with only the long laces and mid-tier price worth noting before you buy.