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Last updated: September 23, 2025 4 min read  Trail running doesn’t play nice. Elevation swings. Rocks want your ankles. Every step becomes a battle with Mother Nature. Enter the Nike ACG Ultrafly, a trail super shoe made for athletes who don’t flinch when thunder cracks. Tested over more than 30,000 miles of punishment on the world’s most twisted terrain, it’s the result of mountains of insight from trail running fiends. The Ultrafly fuses Nike’s fastest road DNA with ACG’s dirt-first durability. Traction. Support. Confidence when the trail tries to buck you. ## 50 Years. Every Runner. Any Terrain. Nike’s obsession with serving runners? Deeper than most canyons. On the road, track or trail, in sunshine or sideways rain, Nike running shoes have half a century of finish line bona fides. Then there’s ACG. With fearless design built to endure nature’s extremes, ACG flipped the script on what outdoor performance gear could be. The Ultrafly carries this legacy forward, equipping runners for places where maps go blank. It moves quickly, breathes easily and holds steady when the trail bites back. One foot in tradition, one in the dirt.  [](https://www.nike.com/w/acg-93bsd)  [](https://www.nike.com/w/acg-93bsd) ## Built for Speed, Adapted to the Trail Every off-road stride demands focus and adaptability. Gear that moves with you, not against you. The Ultrafly stays true to its roots with a design ethos built around speed, agility and athlete-first performance. With a ZoomX midsole and a split carbon Flyplate, the Ultrafly is Nike’s most responsive trail runner to date. “This shoe isn’t just inspired by the terrain,” says Brenden McAleese, Director of ACG Footwear. “It’s engineered to redefine how fast you can move with it.” ## Real Feedback, Real Fast The Ultrafly wasn’t built in a vacuum. It was shaped by runners — men and women, pros and everyday grinders — who know what it takes to move fast through technical terrain. After 13 rounds of testing across 25 states and seven countries, this is the most rigorously tested trail shoe in Nike history. Runners describe it as “light, fast, but stable,” and “one of the best overall shoes I’ve run in straight out of the box.” Nike Trail athlete Drew Holmen calls it “a more stable shoe. A more responsive shoe. A faster shoe. Just straight better.” From vertical European mountain ascents to the podium at Western States, the ACG Ultrafly already has receipts. ## Performance in the Details - __ZoomX Foam Midsole:__ Next-level energy return. Protection when the ground hits back. - __7/8 Split Carbon Flyplate:__ Torsional support. Smooth chaos management. - __Vibram® Lightbase Outsole:__ Gold-standard grip, minus the weight. - __Breathable VaporMesh Upper:__ Durable, drainable and built to weather the storm. - __Gusseted Tongue + Fit Band:__ Secure lockdown. Long-haul comfort.  [](https://www.nike.com/w/acg-93bsd)  [](https://www.nike.com/w/acg-93bsd) ## Designed With an Edge Bold proportions. High silhouette. Safety Orange that screams against the gray. Every detail is earned, not there for show. From the pressure-tested ZoomX foam midsole to the rugged outsole, the Ultrafly comes ready for the climb up and the sprint down. It’s a race-day weapon. Built for logging miles, chasing FKTs or enduring the multiday odyssey. “It’s been my go-to, do-it-all racing shoe,” says Nike Athlete Caleb Olson, 2025 Transgrancanaria Classic and Western States Endurance Run winner. “It can handle some of the most rugged terrain I’ve raced on at Transgrancanaria, as well as the singletrack at Western States. ## Tech Specs - __Weight:__ 287g (Men’s 10) / 225g (Women’s 8) - __Stack Height:__ 28.5mm forefoot / 37mm heel - __Drop:__ 8.5mm - __Lug Height:__ 3mm - __Outsole:__ Vibram® Lightbase - __Midsole:__ Nike ZoomX Foam - __Plate:__ Split carbon Flyplate ## Frequently Asked Questions When Is the Release Date for the Nike ACG Ultrafly? Spring 2026. Men’s and Women’s sizes. What Are the Differences Between the Ultrafly and the Original Ultrafly? More breathable upper. Better internal lockdown. A tweaked Flyplate with less stiffness, more terrain feel. It’s lighter overall, but still packs ZoomX midsole energy and Vibram outsole punch. Just smoother. What Kind of Trails is the ACG Ultrafly Best For? Steep mountain ascents. Technical descents. Long hauls. Loose, rocky, wet surfaces. If it’s nasty, it’s in range. Originally published: September 4, 2025 ## Related Stories -  [](https://www.nike.com/a/nike-acg-zegama-release-info) # Product News # The All-New Nike ACG Zegama: The Ultimate Trail Running Shoe for Tackling Tough Terrain -  [](https://www.nike.com/a/nike-acg-zegama-hike-release-info) # Product News # Introducing the Nike ACG Zegama Hike: A Lightweight Performance Hiking Boot -  [](https://www.nike.com/a/increase-stamina-endurance-for-running) # Activity # How to Increase Running Stamina and Endurance -  [](https://www.nike.com/a/best-running-shoes-marathon) # Buying Guide # Best Running Shoes for a Marathon: Nike Racing and Training Picks -  [](https://www.nike.com/a/nike-acg-pegasus-trail-release-info) # Product News # Take the World by Storm in the Nike ACG Pegasus Trail Resources [Gift Cards](https://www.nike.com/gift-cards) [Corporate Sales](https://www.nike.com/corporate-sales) [Find a Store](https://www.nike.com/retail) [Membership](https://www.nike.com/membership) [Nike Journal](https://www.nike.com/stories) [Site Feedback](https://www.nike.com#site-feedback) Help [Get Help](https://www.nike.com/help) [Order Status](https://www.nike.com/orders/details/) [Shipping and Delivery](https://www.nike.com/help/a/shipping-delivery) [Returns](https://www.nike.com/help/a/returns-policy) [Order Cancellation](https://www.nike.com/help/a/change-cancel-order) [Payment Options](https://www.nike.com/help/a/payment-options) [Gift Card Balance](https://www.nike.com/orders/gift-card-lookup) [Contact Us](https://www.nike.com/help/#contact) Company [About Nike](https://about.nike.com/en) [News](http://news.nike.com/) [Careers](https://jobs.nike.com/) [Investors](http://investors.nike.com/) [Purpose](https://purpose.nike.com/) [Sustainability](https://www.nike.com/sustainability) [Accessibility](https://www.nike.com/us/en/accessibility/#introduction) Promotions & Discounts [Student](https://www.nike.com/help/a/student-discount) [Military](https://www.nike.com/help/a/military-discount) [Teacher](https://www.nike.com/help/a/teacher-discount) [First Responders & Medical Professionals](https://www.nike.com/help/a/first-responder-discount) [Birthday](https://www.nike.com/help/a/birthday-terms-promo) [Resources](https://www.nike.com/help) [Gift Cards](https://www.nike.com/gift-cards) [Corporate Sales](https://www.nike.com/corporate-sales) [Find a Store](https://www.nike.com/retail) [Membership](https://www.nike.com/membership) [Nike Journal](https://www.nike.com/stories) [Site Feedback](https://www.nike.com#site-feedback) [Help](https://www.nike.com/help) [Get Help](https://www.nike.com/help) [Order Status](https://www.nike.com/orders/details/) [Shipping and Delivery](https://www.nike.com/help/a/shipping-delivery) [Returns](https://www.nike.com/help/a/returns-policy) [Order Cancellation](https://www.nike.com/help/a/change-cancel-order) [Payment Options](https://www.nike.com/help/a/payment-options) [Gift Card Balance](https://www.nike.com/orders/gift-card-lookup) [Contact Us](https://www.nike.com/help/#contact) [Company](https://about.nike.com/en) [About Nike](https://about.nike.com/en) [News](http://news.nike.com/) [Careers](https://jobs.nike.com/) [Investors](http://investors.nike.com/) [Purpose](https://purpose.nike.com/) [Sustainability](https://www.nike.com/sustainability) [Accessibility](https://www.nike.com/us/en/accessibility/#introduction) [Promotions & Discounts](https://www.nike.com/promo-code) [Student](https://www.nike.com/help/a/student-discount) [Military](https://www.nike.com/help/a/military-discount) [Teacher](https://www.nike.com/help/a/teacher-discount) [First Responders & Medical Professionals](https://www.nike.com/help/a/first-responder-discount) [Birthday](https://www.nike.com/help/a/birthday-terms-promo) United States - © 2026 Nike, Inc. 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