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Inov-8 Trailfly Ultra G 300 Max Performance Review

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9:36 am
November 2, 2021


Seasoned Veteran

Posts: 801


The Inov-8 Trailfly Ultra G 300 Max is an ultramarathon and long distance trail running shoe that utilizes a new Graphene-enhanced foam called G-FLY.

Inov-8 has utilized Graphene-enhanced rubber on its shoes since 2018. Recently, I tested the Inov-8 Terraultra G270 and the traction was amazing. Because of that testing experience, I’m a believer in Graphene. Graphene was only first isolated in 2004. Inov-8 got interested in 2016 due to Graphene’s ability to increase the strength, elasticity, and durability of other compounds.

For me, the question is, will Graphene help foam as much as it does rubber? Keep reading for my full performance review of the Trailfly Ultra G 300 Max.


In my first impressions post, I said the nba x af1 may be the best cushioned trail runner on the market. There’s no maybe anymore. It’s the best cushioned trail runner on the market. Graphene’s inclusion in the G-Fly foam compound creates something slightly bouncy but still stable enough for trail use. That’s not easy to do. I understand why Inov-8 and others revere Graphene as space-age wonder material.

Graphene does have an intense smell right out of the box but it’s worth it. A few runs minimize the powerful tire rubber-esque smell and then you can focus on the positives. Graphene saves your joints while still allowing you to feel the trail. If you run a lot of trails, you’ll want this shoe in your rotation for the cushion alone.


Graphene Grip rubber is a beautiful thing. I said in the G270 review that it made me feel like Spiderman. That feeling’s still present.

And the incredible durability is back as well. It hardly looks like I’ve put any miles on these despite running a bunch miles including some on pavement. Even the texture on the lugs is hanging around except where I toe off. I test a lot of shoes and that just doesn’t happen. It’s the kind of traction that puts your mind at ease on even the slickest of trails.


The fuse does the majority of the work keeping your foot on the footbed. You don’t really sit below the rim of the midsole foam like in a lot of shoes. And there’s not really a heel counter in the back. But the lacing structure works well to lock you down.

The 6mm drop makes it easy to stay upright. With a stack height of 24mm in the forefoot and 30mm in the heel, I was worried the height would be iffy if I hit a root the wrong way. But on my trail runs, I didn’t notice any instability when tackling root-filled sections. The combo of the upper, lacing system, and extremely grippy traction kept me upright.


In my first run, the Trailfly Ultra G 300 Max felt a little short lengthwise but that went away on the second run. I’d recommend going true to size. Wide footers will have plenty of room due to Inov-8’s generous last and toe box. The shoe clamps down well on more narrow feet as well. The extra room doesn’t compromise stability, comfort, or fit.


I’d still like Inov-8 to figure out a way to get the same amount of stability with less fuse. And while the G 300 Max has less fuse than the G270, it’s still a little too plasticky for $190. To some, this won’t matter, but people do ultramarathons in these bad boys. Fuse just isn’t the best material when you spend that much time on your feet. I understand they use it for durablity but hopefully once G-Fly foam decreases in price we can get a supportive but more comfortable upper construction.


The Inov-8 Trailfly Ultra G 300 Max is the first shoe to feature the Graphene enhanced G-Fly foam and it’s one of, if not the, best trail shoe on the market. The Jordan of amazing cushion and superior traction just puts these above the crowd.

Is $190 a high price? Sure, but that happens when you’re an early adopter of new tech. Could Inov-8 innovate a bit more with the upper? Yep. But that’s minor quibble. This shoe gets the biggest, most important stuff right and will make a lot of trail runners very happy.