Inov-8 TrailFly Pro First Run Review: A Livelier Trail Shoe That Keeps Its Ground Feel

Introduction

The Inov-8 TrailFly Pro is the brand’s new TPE-stacked trail shoe, built to feel livelier underfoot while keeping the flex and ground connection Inov-8 shoes are known for. This first-run look comes from around 80 minutes of mixed coastal trail running, covering runnable grassy stretches, steep narrow tracks, and loose dusty sections on dry ground.

Specs at a Glance

The TrailFly Pro packs a 34mm heel and a 28mm forefoot for a 6mm drop. It weighs 8.4 oz (239g) in a UK men’s 8.5, and it lands at £165 in the UK and $195 in the US.

Design and Build Details

The midsole uses a moderate stack of supercritical nitrogen-infused Powerflow Elite TPE foam, which Inov-8 says delivers its highest energy return to date at around 70 to 75 percent. A rocker shape is designed to create a fast feel, and a 4mm boomerang of light supercritical TPE sits inside.

Up top, the upper is built around a new last with anatomical shaping that follows the sweep of the foot. It uses a single-layer ripstop polyester with 3D printed overlays for structure, plus reinforcement in the toe box that keeps the upper off the toes. The tongue is lightly padded and flat-wrapping, the heel collar has medium padding with extra at the rear, and there is a structured heel counter that sits lower on the lateral side and higher on the medial side to better reflect how ankle bones are positioned. You also get lock-style laces.

Underfoot, the new graphene-infused G-Grip outsole has 4mm lugs and is split into four sections with exposed grooves and cutaways, intended to add flex and a more natural, connected feel on the trail.

Fit and Sizing Notes

The test pair was a UK 8.5 (US 9.5), the tester’s regular size in most shoes including Inov-8. Length clearance is about a thumbs width, and the toe box sweeps around the toes with useful structure that keeps the upper off the top of the toenails, which matters for ultras and steep descents where black toenails are otherwise a risk. The midfoot had no pinching at the toe crease, and lock laces gave good lockdown.

Two things to note: there is a small gap up the side of the tongue that does not sit as flush as it could for keeping debris out, and there was some foot movement on the steepest sections, with the foot sliding forward toward the toe box. Tightening the laces more securely on later runs should help. Heel padding held well and the structured heel counter adds support for long hauls. Overall, normal sizing worked.

Ride and Performance on the Trail

Inov-8 has made real changes here, but the goal seems to be evolution rather than throwing out what people like about the brand. The classic Inov-8 trait of good ground connection is still present, so you can read the terrain through the sole, but there is now noticeably more spring, energy, and rocker returning from the midsole than in older generations, which could sometimes feel a bit dull. Along with that comes added softness underfoot, which felt genuinely welcome on hard, dry trails.

The flex cuts in the midsole keep the shoe feeling the ground, and while that sensation is welcome for reacting to what is underfoot, at times there was a little movement in the midsole that needed careful foot placement, and occasionally the foot moved slightly off the platform. That said, this does not feel like a big, bouncy, high-platform racing shoe. It stays nimble, agile, and connected, and it has disappeared on foot nicely thanks to the anatomical fit.

Who Should Consider It

If you like the traditional Inov-8 feel of a firm, direct shoe with lots of ground feedback, this one moves partway toward the softer, more forgiving modern trail shoe. If you found older Inov-8s a bit too direct, the TrailFly Pro’s happy middle ground of extra energy without losing ground feel may make it a better option for longer runs.

Conclusion

After roughly 80 minutes of mixed trail running, the TrailFly Pro delivered a comfortable, lively, and agile ride with more energy return than past Inov-8 shoes while keeping the ground connection the brand is known for. A small tongue gap and some foot movement on steep climbs are the main early watchpoints, but as a first-run impression this was one of the most enjoyable opening runs in an Inov-8 in a while, and a strong sign it could suit longer distances too.