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 complete tech specs and my first impressions after a quick run in the Trailfly Ultra G 300 Max.
Inov-8 Trailfly Ultra G 300 Max
Release Date April 8, 2021
Weight: 10.5oz / 300g
Drop: 6mm (30mm/24mm)
The Trailfly Ultra G 300 Max is Inov-8’s most advanced shoe to-date and it’s got plenty of features that will appeal to trail runners and shoe nerds alike:
- G-FLY foam provides 25% more energy return than EVA
- G-FLY foam doubles durability (lifespan of 1,200km / 745 miles)
- Midsole stack height of 30mm in the heel and 24mm in the forefoot
- Graphene Grip outsole rubber
- 4mm deep multi-directional outsole lugs
- Vertical outsole grooves for metatarsal independence
- 10mm deep midfoot ADAPTER-FLEX groove for forefoot/heel mobility
- 6mm eTPU Boomerang insole
- Gusseted tongue
- Wide toe-box
I received the Trailfly Ultra G 300 Max yesterday. The following quick thoughts are based on a mile walk last night and a five mile road run this morning.
G-FLY is plush with a nice little bounce. Not a huge bounce, but it’s definitely the best cushion yet from Inov-8. It feels like a more stable version of Nike React. It’s similar in feel to the DNA Loft in the Brooks Glycerin 19. It also feels softer than one of my favorite higher stack trail running shoes, the Brooks Catamount, and may now be the best cushioned trail runner on the market.
As I mentioned in my Terraultra G270 review, Graphene Grip rubber is fantastic. It feels just as grippy in the Trailfly Ultra G 300 Max. I’m looking forward to taking it out on the trails to continue testing the incredible grip strength.
There’s no heel counter but the midsole does rise slightly at the heel for an extra touch of stability. I was honestly surprised that the soft G-FLY foam was so stable. The real test will be running technical trails…but so far I’m optimistic that Inov-8 delivered a softer ride without sacrificing support.
The upper is very similar to the Terraultra G270 but uses less fuse. This is a slight improvement that I lobbied for in my review and feels good so far.
The Trailfly Ultra G 300 Max offers plenty of space for wide footers just like other Inov-8 models. However, on my initial run I thought they may run a touch short. My right foot didn’t feel like I had my typical thumbnail worth of room at the toe. I’ll monitor the sizing and make a final recommendation after some more miles in them.
My early impression is that Inov-8 produced a softer trail shoe that will appeal to a wide range of trail going runners and hikers. Not everyone can handle Inov-8’s typical 0mm drop so adding plush cushioning and increasing to a 6mm drop should win them a lot of customers.
Check back for a full performance review in 2 weeks once I’ve put a bunch of hard trail miles on the Trailfly Ultra G 300 Max.