Inov-8 TrailFly G 280 Review: Lighter, Faster, but Is It Better?

Introduction

Inov-8’s TrailFly Ultra G 300 Max is a genuinely likeable long-run trail shoe: a comfortable midsole and a strong outsole, whatever the terrain throws at it. Its main flaw is weight. At 360-plus grams in the tester’s size, it is unmistakably a heavy trail shoe. So when Inov-8 announced a lighter sibling, the TrailFly G 280, built around a new nitrogen-infused midsole compound called FlySpeed, expectations were high.

The short answer after roughly 40 miles on a wide mix of terrain and weather: lighter is noticeable, and in some ways better, but the new foam gives up a little of the cushioning personality that made the 300 Max so comfortable.

TrailFly G 280: Facts and Figures

The TrailFly G 280 retails for £165 in the UK, which puts it firmly in premium trail shoe territory. In a UK 10.5, it weighs 330 grams, and the midsole runs an 8 mm offset: 22 mm at the heel and 14 mm under the forefoot. It comes in two colourways for men and two for women.

One sizing note worth underlining: this shoe runs small. The tester normally wears a UK 9.5 and needed to size up a full size to a UK 10.5, something that almost never happens in running shoes. If you are considering a pair, plan on at least half a size up, possibly a full one.

Design and Construction

The headline change is a new knitted upper. It feels plush and highly breathable, with reinforcement around the lace eyelets for a bit of structure and durability. A rubber overlay wraps around the toe box, helping the flex points of the upper while doubling as a toe bumper. Padding around the ankle collar, heel cup and gusseted tongue sits at a moderate level, and it strikes a very good balance. Anyone who has found some Inov-8 uppers too stripped back in the past, with lace pressure on top of the foot or stiff collars digging into the ankle bone, should find this one far more forgiving.

The fit carries good width and volume in the toe box, but there is also a fair amount of volume and depth through the midfoot. Runners with deep, wide feet will welcome that. Those with shallower feet may need to cinch the laces down tight to feel locked in, which was workable but not perfect.

The FlySpeed Midsole

This is the part of the shoe that promised the most. FlySpeed is Infused with nitrogen, and the goal is a lighter ride with higher energy return while keeping you connected to the ground. In practice it performs well on most surfaces, and you can really feel the trail underfoot, arguably a touch too much. It is not uncomfortable, but the foam delivers less bounce and plushness than hoped. The midsole in the heavier TrailFly Ultra G 300 Max still feels plusher and more comfortable, particularly on longer runs.

Swapping in Inov-8’s Boomerang footbeds helps with both comfort and bounce, but there is a catch: with those footbeds installed, the shoe weighs 343 grams, which undercuts the whole point of buying the lighter alternative.

Grip and Outsole Performance

The G in TrailFly G 280 stands for graphene, the material Inov-8 has been infusing into its rubber outsoles and some midsole foams for years to raise durability. Paired with the graphene compound is a chunky 4 mm multidirectional lug pattern aimed at mixed terrain.

Over the test miles, grip and traction held up without a single complaint. Wet rock, often a weak spot for trail shoes, was handled confidently, and the lugs even performed well in mud despite their modest depth. The Adapter-Flex groove across the midfoot adds flexibility to the deep stack, helping the shoe adapt on uneven ground. A worry going in was that the groove would become a stone trap, a persistent irritation on trail shoes, but no stones lodged in it during testing, echoing the experience with the 300 Max.

How It Performed Over 40 Miles

Across roughly 40 miles of mixed terrain and conditions, the G 280 felt like a true Inov-8 shoe: well connected, stable and responsive on tricky underfoot surfaces. The weight saving over the 300 Max is obvious, and the shoe feels noticeably more balanced. The durability picture also looks strong. The knitted upper showed no visible wear, the flex points were holding up well, and the graphene rubber still had its surface dimples intact after 40 miles, some of them on tarmac.

Verdict and Comparisons

Price: £165 is steep, and graphene-equipped Inov-8 shoes consistently carry a premium, so the shoe loses marks here. Comfort and performance earn a strong score, held back only by the midsole’s modest bounce. Durability looks very solid, though 40 miles is a limited sample. Add up the categories and the TrailFly G 280 lands at 20 out of 30.

On looks, it sits firmly in the middle: not offensive, not exciting, and the colourways will not win everyone over.

If you want a similar feel, the Inov-8 Parkclaw G 280 delivers something very close, and the TrailFly Ultra G 300 Max remains the plusher, heavier sibling. Outside the brand, the Saucony Peregrine 12 and the Topo Athletic Mountain Racer offer comparable trail performance.

Conclusion

The TrailFly G 280 is a well-built, confidently gripping, connected trail shoe that trades a little cushioning for a meaningful weight reduction. If you want a shoe that handles a broad mix of terrain and weather, keeps you close to the ground, and offers a roomy fit, it deserves a close look, remembering to size up. If you prize deep, soft, bouncy cushioning over lightweight agility, the TrailFly Ultra G 300 Max remains the better choice, weight included.