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

The company takes a new approach to its collection of ultra running shoes, producing 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 claimed to be 40% more responsive than standard inserts.
  • Better outsole adaptability: A deep Adapter-Flex groove helps the heel and forefoot work independently for 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

Facts / Specs

Terrain: Trail
Weight: Men 11.9oz
Drop: Men 6mm
Arch support: Neutral
Forefoot height: Men 24mm
Heel height: Men 30mm
Pronation: Neutral Pronation / Supination / Underpronation

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Inov-8 TrailFly Ultra G 300 Max video reviews