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40Race Shoe FinderEst. 2023 · London

Head to head

HOKA Skyward Xvs
Nike Zoom Fly 6

Skyward X

£190

Typical street price · £225 RRP

■ 48mm — over limit
Zoom Fly 6

£110

Typical street price · £165 RRP

40mm — on the limit

Choose the Skyward X if…

  • You want more shoe underneath you late on: 48mm against 40mm, which is protection over a long race rather than speed over a short one.
  • You have a broad foot, or your toes spread as a long race goes on.
  • You want more races out of one pair: about 700km of competitive life against 600km.
  • You are racing Ultra / 50K+ — built for it, where the Zoom Fly 6 is not.

Choose the Zoom Fly 6 if…

  • Your race is run under World Athletics rules — this one is legal at 40mm and the Skyward X is not.
  • You want the lighter shoe: 248g against 314g, a 66g difference you will feel late in a race.
  • You want a conventional fit rather than a narrow or wide last.
  • Money matters: it is selling around £110 against £190, and the time difference between them is smaller than the price difference suggests.
  • You are racing Half marathon — built for it, where the Skyward X is not.

What does this
mean for you?

Every figure below is recalculated from your race and your current time. The gap between two shoes is not fixed — it grows with how long you are on your feet.

Over marathon from 3:45:00

Time back
Skyward X: 56s–138sZoom Fly 6: 49s–124s
Cost per second saved
Skyward X: £0.18Zoom Fly 6: £0.13

Ranges, not promises. Both figures are against a standard trainer, and the honest answer for most runners is that the difference between two shoes of this class is smaller than the difference a month of decent training makes.

Every number.

010203040504843
Skyward X
010203040504032
Zoom Fly 6

What you pay

Street price
Skyward X£190
Zoom Fly 6£110■

What the shoe is actually selling for across the shops we read, not its RRP.

RRP
Skyward X£225
Zoom Fly 6£165

List price. Almost nobody pays it for a race shoe.

Cost per race
Skyward X£17
Zoom Fly 6£12■

Street price divided by the races the foam stays fast for.

Cost per second saved
Skyward X£0.18
Zoom Fly 6£0.13■

The whole-life question: what each second of race time costs you.

What it does

Estimated saving
Skyward X56s–138s■
Zoom Fly 649s–124s

Against a standard trainer, over the distance and time set above.

Economy gain
Skyward X1.6–2.8%■
Zoom Fly 61.5–2.6%
Built for
Skyward XMarathon · Ultra
Zoom Fly 6Half · Marathon
Best use case
Skyward XA cushioned plated trainer built for comfort over long, slow miles rather than speed.
Zoom Fly 6The sensible answer for a first marathon. Carbon plate, durable foam, a third of the cost per race of an Alphafly because it lasts more than twice as long.

How it is built

Weight
Skyward X314 g
Zoom Fly 6248 g■

Manufacturer figure at men's US 9.

Stack (heel)
Skyward X48 mm
Zoom Fly 640 mm
Stack (forefoot)
Skyward X43 mm
Zoom Fly 632 mm
Drop
Skyward X5 mm
Zoom Fly 68 mm
Foam
Skyward XPEBA over EVA
Zoom Fly 6ZoomX over SR-02
Plate
Skyward Xcarbon fibre
Zoom Fly 6carbon fibre

Rules and fit

Road legal
Skyward XNo (48 mm)
Zoom Fly 6Yes (40 mm)■

World Athletics caps road racing shoes at 40 mm of stack.

Fit
Skyward Xwide
Zoom Fly 6standard
Stability
Skyward Xstable
Zoom Fly 6stable

Neither is better in the abstract — it depends on your stride.

Race life
Skyward X~700 km■
Zoom Fly 6~600 km

How long the foam stays fast, not how long the shoe survives.

Data confidence
Skyward Xverified
Zoom Fly 6verified

■ marks the better figure where one is genuinely better. Fit, foam, drop and stability carry no mark — they depend on your foot and your stride, not on which shoe is superior.

In your size.

Where to buy

Your UK size

Best price today — some sizes£185at Alexandra Sports — £40 under RRP

9 retailer checks failed on the last run, so their prices are missing rather than wrong.

Prices are captured when the site is built and stamped with the time of that check. We never rank a retailer by what it pays us; where a link earns a commission it is marked sponsored and the price you pay is unchanged.

Where to buy

Your UK size

Best price today — some sizes£109.99at Run North West — £55 under RRP

9 retailer checks failed on the last run, so their prices are missing rather than wrong.

Prices are captured when the site is built and stamped with the time of that check. We never rank a retailer by what it pays us; where a link earns a commission it is marked sponsored and the price you pay is unchanged.