Nike Alphafly Next% 2 vs ASICS Metaspeed Sky Plus: Two Elite Carbon Racers Compared

Introduction

The Nike Alphafly Next% 2 and the ASICS Metaspeed Sky Plus sit at the sharp end of the carbon racing shoe market, and both are built with one purpose: making you faster on race day. They share plenty of DNA, including carbon plates, high stacks of super foam, and designs tuned for personal bests. But the differences matter, and they could decide which of the two belongs on your feet.

Key Specs at a Glance

The Alphafly Next% 2 has an 8 mm drop, while the Metaspeed Sky Plus sits slightly lower at 5 mm. In a men’s UK 8.5, the Sky Plus weighs 203 g (7.2 oz), and the Alphafly comes in a chunk heavier at 246 g (8.7 oz). On price, the Metaspeed Sky Plus costs $250 in the US and £225 in the UK, and the Alphafly 2 was expected to launch at around $275 in the US and £260 in the UK.

Midsole and Plate Design

Both shoes use carbon plates and lightweight super foam midsoles. The ASICS places its carbon plate slightly higher up in the midsole, a positioning designed to activate more of the foam across the whole foot, giving a firmer, more propulsive feel than the lower-placed plate in the Metaspeed Edge Plus.

The Alphafly Next% 2 takes a different route with two Air Zoom pods under the forefoot, adding firmness and push at toe off. Compared with the Alphafly 1, this version adds a little extra ZoomX foam under the pods for additional softness. Both shoes carry a high stack of foam running front to rear, which offers meaningful protection late in a race when form fades and you start rocking back onto your heels.

Stability is another point of difference. The Alphafly Next% 2 is slightly wider through the midfoot landing area and noticeably wider in the heel, adding a more stable base than the Metaspeed Sky. At the back of the shoe, the Alphafly has a protruding heel shape, while the Metaspeed Sky has a slight cutaway and slope that can roll you out just a little at the rear.

Upper and Fit

The uppers feel like they come from different philosophies. The Alphafly uses a lightweight, breathable Atomknit 2 structured upper that feels almost plasticky, with a bootie construction and a narrow opening at the top. That means a snug, wrapping fit, but also a shoe you have to work hard to get on, especially if you have high or wide feet.

The Metaspeed Sky Plus takes a more traditional approach with a lighter, more material-feeling knit upper, integrated overlays, a separate minimal tongue, and an easy slip-on fit. Both shoes use similar lock-tight laces with ribbing. Inside the heel, the Metaspeed has more padding with a heel counter built into one piece, while the Alphafly’s cushioning sits separately from a stiffer heel counter. Both fit true to size in testing, with roomy toe boxes and a secure hold around the midfoot and heel.

Ride and Performance

On the road, both are fast, but they reward different styles. The Alphafly Next% 2 has noticeably more punch and propulsion, tipping you forward onto the Air Zoom pods for an explosive, bouncy toe off. ZoomX remains arguably the best foam in carbon racing shoes, and the Alphafly keeps rolling even as fatigue sets in, whether in a long rep, a 20-mile run, or the closing miles of a marathon.

The Metaspeed Sky Plus rides bouncy and comfortable, with a useful tip-forward feeling when you are running well with good form. It worked brilliantly at the fast end: a half marathon PB of 1:10:23 came straight out of the box, and it shines over shorter, quicker efforts. But it rewards purposeful running, and when form slips or fatigue creeps in, the ride feels less effective. The Alphafly is also more forgiving when running slowly feels awkward; the Metaspeed asks you to stay engaged. Notably, the Alphafly delivered a fastest-ever mile on tired legs and handled everything from 3K pace to long marathon stints.

Versatility and Durability

The Alphafly Next% 2 excels on long, straight courses where its weight matters less and its cushioning, width, and propulsive ride shine. It is the marathon specialist here, and Nike positions it squarely for the 42 km distance. The Metaspeed Sky Plus is lighter, nimbler, and corners better, making it the more versatile pick for twisty 5Ks and varied racing.

There is one fit caveat with the Alphafly: the separation between heel cushioning and heel counter caused some heel digging and discomfort during testing, enough to notice over a full marathon, though tolerable when chasing a PB. The Metaspeed Sky Plus disappeared on long runs with no such issues. On the outsole, the Alphafly uses a new grip pattern with thinner rubber and cutaways to save weight, while the Metaspeed adds more rubber at the heel to address past durability problems.

Which One Should You Buy?

If your year revolves around a big marathon and you want the fastest possible shoe over long, straight roads, the Alphafly Next% 2 is the pick. It costs more and is harder to get on, but the ride is measurably faster and more forgiving at race pace. If you race often across different distances, including twisty 5Ks, or plan to spend real training miles in a carbon shoe, the lighter, cheaper, easier-wearing Metaspeed Sky Plus makes more sense.

Conclusion

Both of these are genuinely excellent carbon racing shoes, comfortably among the best available. The Alphafly Next% 2 edges ahead for pure racing speed, particularly over the marathon, while the Metaspeed Sky Plus wins on ease of use, agility, and value. Whichever way you lean, you are choosing between two of the strongest shoes in the category.