The Nike ACG Ultrafly is Nike’s carbon-plated trail racer built for runners who want road-shoe pop without giving up grip and control on real terrain. It blends ZoomX foam with a full-length carbon Flyplate that has been tuned to feel smoother and less harsh than the first version. You still get propulsion, but with better flex and confidence when the trail turns technical.
Underfoot, a Vibram Megagrip outsole delivers reliable traction on wet roots, rock, and loose dirt, striking a balance between bite and roll. The updated upper is more refined and accommodating, improving lockdown while reducing pressure points. Breathability and drainage are improved so the shoe handles long miles, creek crossings, and hot race days without feeling swampy.
This is a shoe for trail racers, ultra runners, and serious trail enthusiasts who move fast over varied terrain. It shines on technical singletrack, steep climbs, and long efforts where you want both bounce and protection. Strong everyday runners can train in it, but it is built with performance in mind.
What’s new compared to the original Ultrafly is a more stable fit, a smoother riding plate that feels less rigid on uneven ground, and sharper traction for better wet-condition grip. The result is a high-stack, high-energy trail shoe that feels more controlled and more versatile than its predecessor.
Listed in US men's sizing. For US women's sizing equivalent, add 1.5 to the men's size to convert.
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