Our verdict


The TrailFly G300 Max is the first max-cushioned trail shoe from Inov-8 that is considered a massive step forward for the brand. It soaks up all the advanced technologies to bring comfort for the long haul (think 100 milers). The shoe lives up to the hype and performs admirably for its higher price point.


  • Abundant cushioning
  • Underfoot protection
  • Sticky grip
  • Road-to-trail versatility
  • Stable platform
  • Comfortable upper
  • Nice and wide toebox
  • Lockdown fit
  • Innovative midfoot flex
  • Amply breathable


  • On the heavier side
  • Not a fast shoe

Who should buy the Inov-8 TrailFly Ultra G 300 Max

The Inov-8 TrailFly Ultra G 300 Max is a neutral trail running shoe best suited for:

  • long distance, marathon, ultra trail running
  • slow-to-moderate paced running sessions or races
  • paved roads, hard-packed trails, rocky paths (but NOT recommended for soft, muddy terrain)

Inov-8 TrailFly Ultra G 300 Max Inov-8

Feels easy on the feet

The Inov-8 TrailFly G300 Max impresses runners with its soft, “fat tire”-like G-Fly foam. It’s not as soft as in the Hoka Speedgoat but feels easy on the feet after hours of running.

Inov-8 TrailFly Ultra G 300 Max Feels easy on the feet

Inov-8 trail shoes have been associated with firmer, closer-to-the-ground, aggressive silhouettes. This time around, we get a high-stack (the highest in the brand's lineup, actually), softer, hybrid TrailFly.

The TrailFly Ultra G 300 Max offers a well-cushioned platform

This shoe is one of the most anticipated ultra running shoes, and it is a well-cushioned option for hours of comfort.

Inov-8 TrailFly Ultra G 300 Max well-cushioned

When it comes to underfoot protection, there is no need for a rock plate as the foam “swallows stones and pebbles.”

Not a fast shoe

Several reviewers were disappointed that the declared 300 grams correspond to the US men’s size 8. The next size up is 1.3 oz (38 g) heavier.

Inov-8 TrailFly Ultra G 300 Max Not a fast shoe

More than a few runners expressed that the cushion holds you back from speeding up, feeling “cumbersome and clumsy.”

What's more to like about the TrailFly Ultra G 300 Max?

Inov-8 TrailFly Ultra G 300 Max about the TrailFly

  • Better cushioning: Graphene-infused G-Fly foam is reported to have a 25% higher energy return that lasts for dozens of miles at a time.
  • Added energy return from the insole: The Boomerang insole is 40% more responsive than standard inserts.
  • Better outsole adaptability: A deep Adapter-Flex groove helps the heel and forefoot work independently and deliver optimum foot movements on various terrain.
  • G-Grip: 50% more durable and stickier than regular rubber.
  • Secure lockdown: Thanks to the gusseted tongue and Adapter-Fit overlays.
  • Plenty of wiggle room: Marked 5/5 on Inov-8's Fit Scale, the shoe boasts a wide forefoot.

Inov-8 TrailFly Ultra G 300 Max vs. TerraUltra G 270

TerraUltra G 270 became a hit in 2020 and became a "trail shoe of the year" for many avid runners. Is TrailFly Ultra G 300 Max is worthy counterpart?

What’s the same?

Inov-8 TrailFly Ultra G 300 Max Grip

  • G-Grip with 4 mm lugs
  • wide toebox (Fit Scale 5)
  • adapter-fit upper + gusseted tongue

What’s different?

  TrailFly G 300 TerraUltra G 270
Weight 300 g 270 g
Drop 6 mm 0 mm
Heel height 30 mm 12 mm
Cushioning softer, more impact protection, more long-distance comfort firmer, more grounded
Other benefits Adapter-Flex: 10-mm cut for underfoot maneuverability feels faster
Price $190 $160