Nike Alphafly 3
£285
UK RRP
Midsole to scale · mm · red dashes mark the 40mm road limit
- Weight
- 198 g
- men's US 9
- Stack
- 40 / 32 mm
- heel / forefoot · drawn above, against the 40mm line
- Drop
- 8 mm
- Plate
- carbon fibre
- Foam
- ZoomX with Air Zoom pods
- Stability
- balanced
- Competitive life
- ~250 km
- before the foam stops giving it back
- Built for
- Half · Marathon
Verdict
Still the reference marathon shoe. The Air pods give a propulsive forefoot that nothing else quite replicates, and the wider platform makes it manageable late in a race when your form has gone.
■ Caution
Sits at exactly 40mm — legal, but with no margin. It is a lot of shoe for anyone racing slower than about 4:30/km, and the forefoot pods reward a genuine forefoot strike.
Straight answers
- Is the Nike Alphafly 3 legal for road racing?
- Yes. The Nike Alphafly 3 measures exactly 40mm — precisely on the World Athletics 40mm road limit, legal with no margin. The limit only binds Applicable Competitions (championship, elite and record-eligible fields); most club and local races apply no shoe rule at all.
- How much does the Nike Alphafly 3 weigh?
- 198g in a men's US 9 (UK 8), by the manufacturer's stated figure. Weight moves roughly 3.5% per UK size step, so a UK 11 weighs materially more than the spec sheet says.
- What is the stack height and drop of the Nike Alphafly 3?
- 40mm at the heel and 32mm at the forefoot — a 8mm drop. A carbon-fibre plate runs through ZoomX with Air Zoom pods.
- How long does the Nike Alphafly 3 last?
- We estimate roughly 250km of competitive life — the point at which the foam has degraded enough that you are no longer getting the benefit you paid £285 for, not the point at which the shoe falls apart. Spread over race cycles, that is what the cost-per-race figure on this page is built from.
- Is the Nike Alphafly 3 good for a marathon?
- Yes — the marathon is one of the distances it is built for (half marathon and marathon). Still the reference marathon shoe. The Air pods give a propulsive forefoot that nothing else quite replicates, and the wider platform makes it manageable late in a race when your form has gone.
Legality by event
Alphafly 3 at 40mm · every panel drawn to one scale
Road racing
40mm · 0.0 clear
Track events
20mm · 20.0 over
Field events
20mm · 20.0 over
Cross country (spiked shoes)
20mm · 20.0 over
Cross country (non-spiked)
40mm · 0.0 clear
Race walking
40mm · 0.0 clear
Mountain and trail
no limit
Drawn from the manufacturer’s stated stack height, which is not the measurement World Athletics takes — the rule is measured on a men’s US 8.5 sample, and larger sizes may legally exceed it. An indication, not a ruling. Limits bind Applicable Competitions; most club and local races apply no shoe rule at all. What that means in practice.
Reading — what would the Alphafly 3 save you?
Time bought back
−2:59 – 4:20
Off 3:45:00, that lands you at 3:40:40 on the optimistic end.
- Per race
- £72
- ~3.9 races in the foam
- Per second
- £0.33
- whole-life basis
- Sticker
- £285
- UK recommended retail
Economy gain 3.4–4.6% v. a traditional flat, adjusted for pace and your current shoes. Full method.
Manufacturer-stated specs unless marked estimated · last reviewed 2026-09-04 · prices are UK RRP; check the retailer for the live figure.