Nike has offered the first official look at the ACG Kigerfly, a mysterious new trail-running shoe that has been quietly tested by athletes in competition.
The company revealed the mud-covered prototype as part of a wider story about its All Conditions Racing Department, a group of elite runners helping Nike develop new trail footwear through real-world racing.
Nike says the athletes have worn the Kigerfly across climbs, technical descents and long-distance events, collecting podium finishes while feeding information back to its designers.
However, the brand has stopped short of revealing many of the specifications that usually accompany a new performance shoe.
There is no confirmed weight, stack height or heel-to-toe drop, while Nike has yet to say what rubber compound it uses or whether there is a plate hidden inside the midsole.
ZoomX heads for the trails
All that said, the images still give us a few clues. ZoomX branding is clearly visible along the midsole, confirming that Nike’s lightest and most responsive cushioning foam forms part of the design.
The Kigerfly also features a close-fitting knitted ankle collar, a thin ribbed upper and bonded reinforcement around the toe, heel and midfoot.
Its forefoot looks relatively broad, while the dramatically sculpted rear section flares out on either side of the heel.
That unusual geometry could be intended to improve stability on uneven terrain, although Nike has not confirmed its purpose.
Small outsole lugs are also visible beneath the shoe, suggesting it has been designed for firmer and more technical trails rather than deep mud.
Visually, the Kigerfly appears leaner and more race-focused than the max-cushioned Nike Zegama.
It also looks substantially different from the existing Terra Kiger, despite sharing part of its name.
Nike has not said whether the new model will replace the Terra Kiger or sit alongside it as a dedicated racing option.
It has promised to reveal more about the technology behind the shoe in early 2027, with further appearances expected on race podiums before then.
Head over to Nike Running to find out more.
