These two elite Nike shoes are built to go fast on race day. Brigid Kosgei set a new women’s marathon world record wearing the Vaporfly (a record since broken in September 2023 by Tigist Assefa, who wore the Adidas Adizero Adios Pro Evo 1), while Kelvin Kiptum was wearing the Alphafly when he set the new marathon world record of 2:00:35 in Chicago in October 2023. American star Galen Rupp, also a distance specialist, is known for racing in the Alphafly too.
On paper, both shoes share the same recipe: a thick midsole, ZoomX foam and a Flyplate carbon-fiber plate. The Alphafly 4 is taller at the heel, and the Vaporfly 4 is a bit lighter, by about 20 g / 0.7 oz.
For a long time, the Vaporfly and the Alphafly both targeted the marathon, and the choice mostly came down to taste. With the Vaporfly 4, Nike tidied up its lineup.
The Vaporfly is now geared toward shorter distances and fast paces: from the 5K to the half marathon, plus speed workouts. The Alphafly 4 remains THE Nike shoe for the marathon, with no distance limit.
That repositioning shows in the dimensions too. The Vaporfly 4 moves to a slightly lower drop and sits closer to the ground, while the Alphafly 4 keeps a standard drop and its deep cushioning.
The Alphafly also has two Air Zoom units (pods filled with compressed air) under the forefoot, redesigned on this version 4 and lighter according to Nike, for a very comfortable push-off over the distance. Its midsole stacks a new, lighter ZoomX LT foam over the ZoomX.
Above all, the two don’t suit the same runner. The Alphafly 4 is the less demanding of the two. Its rocker is more moderate than before, but the mechanical feel of the Air Zoom units keeps the ride responsive without requiring an aggressive forefoot strike. Even heel strikers benefit from its propulsion.
The Vaporfly 4 is more demanding. To get the most out of it, you need good running form: a sharp stride, for experienced runners. It’s a shoe for seasoned racers.
For lockdown, both uppers are precise. The Alphafly 4 adds midfoot cables, and the Vaporfly 4 is narrower: some testers found it too tight.
Version 4 of the Alphafly also widens its base and plate, for stability fully on par with the competition. The lower Vaporfly 4 is stable too.
Vaporfly or Alphafly: Which Should You Choose?
The choice is clearer than it used to be. For the marathon, or if you want energy savings, pick the Alphafly 4: its mechanical propulsion and its stability make it more forgiving than most carbon racers, including as a first carbon-plated shoe (not for a beginner).
For shorter races, the Vaporfly 4 is built for speed: lower and more responsive, but you really need good form to get the most out of its propulsion. The Alphafly 4 is a bit pricier, about $10 more.
If in doubt, try them on in a store or in training: both are benchmarks, each excellent over its own distances.
