The Nike Alphafly 4 is the latest version of Nike’s flagship marathon racer, and on paper it changes three things: a new upper, a new ZoomX LT (lightweight) foam, and a redesigned air unit in the forefoot. My short verdict: it is a better Alphafly 3. Whether that is enough to justify the price depends entirely on what is already in your rotation.
Upper and Fit of the Nike Alphafly 4
What works for me
The upper is new and it is good. The material feels nice against the foot, it is breathable, and the heel tab stays super pliable, which has always been an Alphafly signature. Comfort is a step up, and I think wider feet will get on well with this shoe. Putting it on, the fit is generous in width without feeling sloppy.
What doesn’t work for me
Sizing is the one thing to get right. I tested a US 10.5 and it ran short, with my longer left foot pressing right up against the front. Go true to size, or if anything half a size up, especially if you are racing a half or a full where your feet will swell. There is nothing wrong with the upper itself, you just want the length right.
Midsole and Ride of the Nike Alphafly 4
What works for me
This is where the changes live. The new ZoomX LT foam makes the ride noticeably softer once the shoe is broken in, and the word that kept coming to mind was butter smooth. It is a modern foam that rolls nicely and feels refined underfoot. In the forefoot, the redesigned air units are super bouncy and lively, and that is the standout sensation of the shoe. When you load the front end and push off, it propels you. The Stryd numbers backed up the feel too: against both the On and the adidas, the Alphafly stored and released more energy through the forefoot, so the springiness is real, not just marketing.
What doesn’t work for me
The softness comes with a trade-off. The heel is now soft enough that it almost bottoms out when you land on it, and I could feel myself getting stuck back there. That pushes the Alphafly 4 even further towards being a forefoot runner’s shoe than previous versions. It is also less stable as a result, and the data pointed to a higher impact load on the legs, which over a full marathon could mean more fatigue creeping in late. If you land on your heel or you want a stable platform, this is not the one.
Outsole of the Nike Alphafly 4
Grip and Traction
The outsole is butter smooth and does its job without drawing attention to itself. Coverage is good, and I had no issues across the surfaces I ran. I do not think Nike changed the compound much from the version three, but there is nothing to complain about here.
Durability
Early days, but the outsole coverage looks solid and I have no concerns so far. The bigger question mark with any soft ZoomX shoe is how the foam holds its properties over its compression cycles, and that is something only mileage will tell.
Conclusion
Value for Money
At €280, the Alphafly 4 is priced like the premium race shoe it is, and the shoe delivers a premium ride. The honest issue is not the shoe, it is the upgrade. Here is where the Apple comparison fits: Nike is behaving a bit like a large tech company shipping the next iPhone. The iPhone 18 is a fine phone, but if you own the 17 you do not need it. Same logic here. If you are coming from an Alphafly 1 or 2, or from another brand, the 4 is a great buy. If you already own and like the Alphafly 3, the gains are marginal and I would not tell you to spend the money.
Fitting it into a shoe rotation
The Alphafly 4 is a race day and fast session shoe, full stop. It is at its best on marathon pace efforts and tempo work where you are on the forefoot and pushing. It slots in alongside a daily trainer, never as a solo shoe. Lighter forefoot strikers around 60 to 65kg will get the most out of it, since they can compress the forefoot without bottoming out the heel. Heel strikers, heavier runners, and anyone who needs stability will be better served elsewhere.
Final Verdict
The Nike Alphafly 4 is a very good shoe and, on its own terms, a better Alphafly 3. It is softer, smoother, and even more fun in the forefoot, and you can absolutely race well in it. My reservation is not about quality, it is about direction and value. Other brands are moving their tech forward faster, and this feels more like a refinement than a leap. If you love the Alphafly line and you are due a new pair, you will love this one. If your current Alphafly still has life in it, hold onto your €280.
Comparisons Against Similar Shoes
Nike Alphafly 4 vs On Cloudboom Strike 2
These are two of the best race shoes on the market right now, and they feel very different. The Alphafly wins on comfort and upper: the material is better, the heel sits better, and it fits like a glove, though the Cloudboom’s more traditional tongue is a nice touch. The On uses a drop-in midsole in this version, and you can feel that insert underfoot, which takes the edge off the comfort. On the data, the Cloudboom Strike 2 came out slightly more efficient, needing marginally less power to hold the same pace and loading the legs a touch less, which hints at a shoe that may hold up better deep into a marathon. The Alphafly feels bouncier and more lively, especially in the forefoot, but that liveliness costs a little efficiency. For me, between these two exact versions I lean Alphafly for the ride and the comfort. Worth knowing: the On also comes in a LightSpray version that is lighter, more comfortable, and drops the insert, and that one would genuinely challenge the Alphafly.
Nike Alphafly 4 vs adidas Adios Pro 5
This one splits cleanly by running style. The Alphafly is the softer, mushier, more aggressive shoe, with a dead-feeling heel and an explosive forefoot. The Adios Pro 5 is firmer, more stable, and more democratic: heel strikers and forefoot strikers alike get on with it, and it feels a touch more efficient and easier on the legs. The upper goes to the Alphafly for pure comfort, though the Pro 5 has the better, lower-pressure lacing. On the numbers, the Alphafly stored more energy through the forefoot but also put more impact load on my legs, while the Pro 5 rolled more smoothly. My take: heel strikers, heavier runners, and marathon distance go Adios Pro 5. Forefoot strikers chasing 5K to half marshal pace and a springy toe-off go Alphafly 4. One caveat on the Pro 5: there are real durability concerns floating around about the foam breaking down early, so keep an eye on that.
Nike Alphafly 4 Quick Questions
How should I size the Alphafly 4?
Go true to size, or half a size up if you want extra toe room for longer races. It runs a little short.
Is the Alphafly 4 a good shoe for marathon racing?
Yes, you can race a marathon in it, but it suits lighter forefoot strikers best. Heavier and heel-striking runners may fatigue late as the soft heel bottoms out.
Is the Alphafly 4 better than the Alphafly 3?
Yes, it is softer and smoother with a livelier forefoot. But the gains are incremental, so Alphafly 3 owners do not need to upgrade.
Is the Alphafly 4 good for heel strikers?
Not really. The heel is soft and bottoms out on landing, which makes it a forefoot runner’s shoe.
Is the Alphafly 4 a stable shoe?
No. It is soft and on the unstable side, so runners who need stability or have high pronation should look elsewhere.
Can I use the Alphafly 4 for daily training?
No. It is a race day and fast session shoe. Pair it with a daily trainer for easy mileage.
How much does the Alphafly 4 weigh?
188g in a men’s sample US 8.5, which is light for a maximal race shoe.
Is the Alphafly 4 worth €280?
If you are upgrading from an older Alphafly or another brand, yes. If you already own the Alphafly 3, the upgrade is hard to justify.
