The new Nike Alphafly returns 10% more energy and weighs 5% less, with every component rethought to help you hold pace once fatigue sets in.
- Nike Alphafly 4 delivers 10% more energy return than the previous model and is 5% lighter.
- The new ZoomX LT foam is up to 17% lighter than standard ZoomX and is layered above and below the carbon plate.
- A seamless Atomknit upper, dual forefoot Air Zoom units, and a Fast Shot outsole complete the system.
- Early limited release starting September 17 at nike.com, with broader availability from October 29, including select retailers.
Every marathon has a stretch where holding your pace costs more than finding it did. Your stride shortens an inch at a time, and your legs answer each command a beat late. Nike Alphafly 4 was designed around that moment. The new version returns 10% more energy than its predecessor, weighs 5% less, and updates every major component: upper, midsole foam, Air Zoom units, plate, and outsole.
It’s built for anyone who races 26.2 miles, from elites chasing podiums to amateur marathoners chasing a PR. The goal was never to make an already fast shoe faster; it was to help more runners hold on to speed and efficiency as fatigue reshapes the race. That’s the most interesting design decision in this generation, because it moves the focus from top-end speed to how long you can sustain it.
A Lighter Foam, Above and Below the Plate
The biggest change from the last version is in the midsole. The new ZoomX LT foam is up to 17% lighter than standard ZoomX, returns 8% more energy, and feels softer and bouncier. Nike pairs it with ZoomX and stacks the two in layers, above and below the plate, to build a cushioning system tuned to the specific demands of long distance.
Think of a trampoline to see how the layers work together. The carbon-fiber Flyplate is the frame that gives shape and direction; the foam is the bed that stores the energy of each footstrike and hands it back. The plate combines stability and propulsion, keeps the rocker profile that has always defined Alphafly, and, together with the cushioning around it, delivers a smooth roll-through that carries your body forward and helps you hold a steady cadence.
Up front, the dual Air Zoom units return with a refined design, tuned to work with the foam and plate for a responsive toe-off at race pace. Underneath, the lightweight Fast Shot outsole provides traction and grip, keeping every stride connected to the pavement without adding weight.
An Upper That Keeps Your Foot in Place
Three hours into a run, a tiny rub becomes the only thing you can think about. The new Atomknit upper addresses that with a soft, breathable, fully seamless build. Stability comes from elements built into the fabric: medial-side cables, heel reinforcements, and a molded sockliner that follows every footstrike. The result is a precise fit that leaves your head free to focus on the race.
From Athletes to the Lab
Alphafly 4 comes out of a specific way of working. Athletes point to what needs developing, researchers at the Nike Sport Research Lab find new solutions, and designers and engineers turn those into components based on how runners actually move and race. That last step carries weight here: the biomechanics work behind Alphafly 4 was thorough and extensive.
“A marathon is dynamic,” says Emily Farina, Senior Principal, Running Footwear, at the Nike Sport Research Lab. “With Alphafly 4, we spent years listening to athletes, studying how fatigue impacts performance and running mechanics…” The aim, as she describes it, was a shoe that helps athletes feel more confident and capable in the closing stages of the race.
The first real test has already come. Addisu Gobena won the Sydney Marathon in Alphafly 4 and set a course record along the way: “When the race became difficult, I trusted the work I had done and trusted the shoe beneath me.”
It’s the latest chapter in a story that has reshaped the modern marathon. The same line of development runs through Eliud Kipchoge’s sub-two-hour marathon, the late Kelvin Kiptum’s world record, Sifan Hassan’s Olympic gold in Paris, Conner Mantz’s American record, and Jacob Kiplimo’s half marathon world record. Alphafly 4 brings that experience to a wider field of marathoners, with a clear job: helping them hold their strength a little longer, deeper into the race.
Where It Fits, When It Drops, and What It Costs
Alphafly 4 is part of Nike’s racing shoe lineup, where each model has a defined role: your first races, getting faster over 10K (6.2 miles), a marathon PR. Every shoe in the line is built as a system, with Air to return energy, foam to manage cushioning and weight, a plate to shape the transition, and an upper to support the foot. Alphafly 4 is the marathon pick. It’s available as an early limited release starting September 17 on nike.com. From October 29, distribution expands to nike.com and select retailers, with an Italian list price of €279.99.
