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Nike

ACG Ultrafly

TrailPlanned release 2026-02-02JP

Nike ACG Ultrafly is the second-generation super shoe for long trail races. Its full-length carbon-fiber FlyPlate is less rigid than the original Ultrafly and uses a split spine to flex over roots and rocks. ZoomX foam pairs with Vibram Megagrip and Litebase for propulsion and traction, while a wider forefoot and heel, trail-specific last, and drainage-focused upper support long efforts across varied terrain.

Intended uses:
Trail, Race

Specs

Weight
287g
Of 948 known values: 601 lower, 5 equal, 342 higher. The marker uses the midpoint of equal values.
Standard63.7th percentile (tie midpoint) / average +19g
Drop
8.5mm
Of 961 known values: 751 lower, 4 equal, 206 higher. The marker uses the midpoint of equal values.
higherUpper 21.9%, including ties / average +1.7mm
Stack (heel/forefoot)
37 / 28.5mm
Of 788 known values: 488 lower, 41 equal, 259 higher. The marker uses the midpoint of equal values.
Standard64.5th percentile (tie midpoint) / average +2.7mm
Carbon plate
Yes
17% of 866 known models have carbon plates
Midsole
ZoomX
Outsole
Vibram Megagrip / Litebase
Reference price
$260
US price
Weight measurement and plate details
Weight note
Approximately 287 g for men's size 28 cm from the exact Nike Japan HF5668 product page, not the global press release. The separate 27 cm sample is not substituted.
Plate note
Nike Japan official news confirms a carbon-fiber Flyplate combined with ZoomX foam and Vibram LITEBASE outsole.

Prices and release dates by market

2 markets are registered. Values are shown as published for each market: no currency conversion and no guessed days or months. Reference prices are not current shop prices.

Reference prices and release dates by market
MarketReference priceRelease
United StatesUS
$260Shown aboveBefore tax
Not registered
JapanJP
¥36,080Tax incl.
2026-02-02Shown abovePlanned release

Changes from the previous model

A comparison with the registered values for Nike Ultrafly Trail.

In the registered data, weight is 13g lighter at 287g, heel stack is 1.5mm lower at 37mm, and forefoot stack is 1.5mm lower at 28.5mm.

These are differences between registered values, not a controlled comparison at the same size and measurement conditions. See the notes below the specs for weight conditions.

View Ultrafly Trail specsCompare both models

Compare within the database

See where these specs sit in the overall distribution. You can also compare within the same category.

Comparison: All data (1,044 shoes)

Position map

This shoeregistered average

Weight x stack height

registered average: 266g / 34.4mm (768 shoes)

The scatter plot includes only shoes with both weight and stack height registered.

Spec distributions

This shoeregistered average

Weight

This shoe 287gregistered average 268g (948 shoes)

96g383g

Drop

This shoe 8.5mmregistered average 6.8mm (961 shoes)

0mm12mm

Stack height

This shoe 37mmregistered average 34.3mm (788 shoes)

6mm58mm

Items with missing numeric values are excluded. Sample sizes and measurement conditions vary between models; this distribution is not a performance ranking.