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Nike Vaporfly 4
Sizing & fit guide

Our verdict
True to size
The Nike Vaporfly 4 fits true to size for most runners, but the racing forefoot is low-volume — narrow or high-volume feet feel it. It's roomier than the Vaporfly 3 was, so runners who sized up in the 3 can usually return to true size in the 4.
Low confidence

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Why the Nike Vaporfly 4 fits this way

The Nike Vaporfly 4 is a marathon racing shoe, and the harvest signal points to true to size with a forefoot-volume caveat. A direct first-impression in the comparison threads: "Just got the VF4... Fit TTS and much lower volume in the forefoot." That captures it — the length is true to size, but the racing upper sits low over the toes, so runners with high-volume or wide forefeet feel the snugness even when the length is right.

Context matters: the Vaporfly 4 was redesigned with a more accommodating fit than the notoriously narrow Vaporfly 3. Runners who had to size up or fight the fit in the 3 generally find the 4 works at true size. Because it's a race-day shoe worn for a focused effort, many runners accept a slightly snug, locked-in fit by design — but for half/full marathons where feet swell, those between sizes or with wider feet lean toward the next half size up.

Net: true to size in your normal running size for standard and medium feet. Narrow feet get an ideal racing lock; wide or high-volume forefeet should consider a half up for swell room on long efforts. Confidence is low given the model is new and dedicated sizing posts are still limited.

Common scenarios

I wear US 10 in my daily trainer. What size Vaporfly 4?

US 10 — the VF4 fits true to size. If you have a wide or high-volume forefoot, or you're racing a marathon where feet swell, consider US 10.5.

I sized up in the Vaporfly 3. Do I need to in the 4?

Usually not — the VF4 is more accommodating than the narrow VF3. Most runners who fought the 3's fit return to true size in the 4.

The forefoot feels snug even though the length is right. Normal?

Yes — the VF4's racing upper is low-volume over the toes. That's by design for a locked-in race fit; wide/high-volume feet may prefer a half up.

How it compares to other models

  • Nike Alphafly 3 Low confidence

    Both racing shoes fit true to size; the Alphafly has a more built-up, slightly higher-volume upper than the low-profile Vaporfly forefoot

  • Nike Pegasus 41 Low confidence

    Both true to size; the Vaporfly's racing forefoot is lower-volume than the daily-trainer Pegasus

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