Meet the upcoming Nike Ultrafly 2, aka Nike ACG Ultrafly
The all-new Nike Ultrafly 2 — now named the Nike ACG Ultrafly — has just been revealed ahead of its Spring 2026 launch. This carbon-fiber-plated trail super shoe is designed to enhance speed across all trail disciplines. It utilises a well-cushioned 37mm/29mm stack height, comprised of dual-density ZoomX foam alongside a ZoomX sockliner (insole). A Vibram Litebase outsole is used for trusted grip and durability. The shoe receives a significant update from the current version, which has received mixed customer reviews.
Nike Ultrafly 2 / Nike ACG Ultra Tech Specs:
Stack Height: 37mm / 29mm
Heel-to-toe drop: 8mm
Weight: 287g / 10.1oz for men’s, 225g / 7.9oz for women
Launch Date: Jan-March 2026
Technologies: ZoomX foam, Carbon Fiber FlyPlate and Vibram Litebase rubber
Plate: Yes, forked carbon fiber plate
Best for: Trail supershoe for racing, ultra distance capable
What is Nike ACG?
Nike ACG stands for All Conditions Gear, a lesser-known sub-department of the brand that has focused on outdoor gear and apparel since the 1980s. In recent times, Nike ACG has leaned more into the Gorpcore trend — a fashion movement where outdoor wear is used recreationally for streetwear — with tight distribution and less emphasis on performance.
However, Nike has begun merging Nike Trail into Nike ACG, with the intention of making ACG performance-focused again and a more recognised, commercial sub-brand. Hence the name change from Ultrafly 2 to Nike ACG Ultrafly.
What’s new about the Nike ACG Ultrafly?
The midsole still features ZoomX foam, but it has been tuned to be more stable with a density appropriate for trails (rather than the squishiness you’ll find on Nike’s road shoes). Embedded in the midsole is a new carbon fiber Flyplate, now split to allow more flexion over uneven terrain compared to the previous version. The shoe is also slightly lighter than before, shedding approximately 15g (0.5oz).
The upper has been completely redesigned. Alongside a wider, trail-specific last, the shoe now offers a more accommodating fit.
The outsole continues to use the trustworthy and widely praised Vibram Litebase, a popular choice across various other brands. The lugs are (seemingly) around 3mm deep.
Who is the Nike ACG Ultrafly suited for?
Runners looking for an aggressive racing shoe with carbon fiber propulsion — one that is well-cushioned but not overly maximal — may find the ACG Ultrafly a compelling option. It’s ultra-distance capable, or vertical mile speedy. This type of shoe typically isn’t your daily trail running shoe, but a shoe reserved for key long runs and races.
Carbon-plated trail shoes typically perform best on runnable terrain that isn’t overly technical, as they lack the flex needed to adapt to uneven surfaces and minimise ankle instability. As such, the ACG Ultrafly may be best reserved for well-groomed, non-technical trails.
