Nike’s ACG revival has been one of the best stories in the outdoor world this year. Since relaunching the label ahead of the Winter Olympics, the Swoosh has assembled an elite trail team, put the Ultrafly on the top step at Western States, and generally reminded everyone that it can do dirt just as well as asphalt.
Now comes the encore, because Nike has officially pulled the sheet off the ACG Kigerfly, a prototype trail racer that’s been hiding in plain sight all season.
Raced First, Revealed Later
Most shoes get a glossy campaign before they’ve touched a starting line. The Kigerfly did things backwards, logging 18,021 test miles under members of the All Conditions Racing Department, per ACG, and racking up multiple podium finishes before Nike ever acknowledged the project existed.
That’s the same playbook that produced the Ultrafly, which endured 13 rounds of testing and over 30,000 miles before launch. Clearly, this strategy is working for the brand.
Shown Dirty on Purpose
And about that reveal. Rather than a pristine studio render, Nike unveiled the Kigerfly absolutely caked in dried mud, looking like it was pulled off an athlete’s feet at the finish line.
Looking beyond the dirt and grime, the details start to emerge her for the new silhouette. There’s confirmed ZoomX foam in the midsole (Nike’s lightest, bounciest compound), a snug knitted ankle collar, a thin ribbed upper with bonded reinforcement, and a dramatically sculpted heel that flares out on both sides. Flip it over and you’ll find low-profile chevron lugs with a rubberized ACG badge sitting dead center.
What Nike Isn’t Saying
Unfortunately, Nike hasn’t confirmed any of the numbers that matter. That means no weight, no stack height, no drop, and no word on whether there’s a plate buried in all that ZoomX.
The Kiger lineage has long been Nike’s nimble, lower-riding trail line, and this silhouette reads far racier than anything wearing that badge before. Where it slots in next to the $260 Ultrafly is anyone’s guess until the full tech breakdown arrives in early 2027.
Spec Sheet
Brand: Nike ACG
Model: Kigerfly (Prototype)
Category: Trail Racing
Midsole: Nike ZoomX foam
Upper: Ribbed knit with bonded reinforcements and knitted ankle collar
Outsole: Low-profile chevron lugs
Testing: 18,021 miles with the All Conditions Racing Department
Weight/Stack/Drop: Unconfirmed
Full Reveal: Early 2027
Pricing & Availability
No price, no release date, no retail info whatsoever. Nike says a deeper look at the tech behind the Kigerfly is coming in early 2027, and until then, your best chance of seeing one is at the front of a trail race.
Recap
Nike ACG Kigerfly Prototype
Nike finally acknowledges the ACG Kigerfly, a mud-caked ZoomX trail racer that logged over 18,000 test miles and multiple podiums before the brand ever confirmed it existed.
