Nike Alphafly 4 Review

Name: Nike Alphafly 4
Brand: Nike

Notice Below are the preliminary measurements for the Nike Alphafly 4. Members have early access to the test results, and some measurements may be updated before publication.

The full review will be published in a few days.

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Tested using Methodology v0.16

Intro
Our Verdict
Changelog
Energy Return
Stability
Cushioning
Wet & Warm Weather
Bounciness
Snappiness
Roll
True To Size
Additional Tests
Comments

Weight Lock g (Lock oz)

Heel-To-Toe Drop Lock mm

Plate Locked

Heel Stack Height Lock mm

Changelog

Updated Oct 15, 2026: Early access published.
Updated Oct 13, 2026: Our testers have started testing this product.
Updated Oct 07, 2026: The product has arrived in our lab, and our testers will start evaluating it soon.
Updated Oct 02, 2026: We've purchased the product and are waiting for it to arrive in our lab.

How We Test Running Shoes

We've bought and tested more than 300 running shoes. Every pair purchased with our own money, never supplied or sponsored by brands. Our data-driven tests are designed to go beyond marketing claims, and since every shoe goes through the exact same methodology, you can directly compare results to find the right pair for your needs.

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Test Results

Design

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Weight

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Nike Alphafly 4 Left Shoe Weight Photo Sample

Weight Locked Lock g (Lock oz)

Internal Shape

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Nike Alphafly 4 3D Model Internal Sample

Internal Length Locked Lock mm (Lock")

Internal Heel Width Locked Lock mm (Lock")

Internal Forefoot Width Locked Lock mm (Lock")

Wide Sizing Available Locked Locked

Foam

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Nike Alphafly 4 Secondary Foam Picture Sample

Primary Foam Name Locked Locked

Primary Foam Type Locked Locked

Secondary Foam Name Locked Locked

Secondary Foam Type Locked Locked

Laces

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Lace Type Locked Locked

Width Locked Lock mm (Lock")

Thickness Locked Lock mm (Lock")

Stretch Locked Lock%

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Energy Return

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Forefoot Compression Energy Return

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Nike Alphafly 4 Forefoot Energy Return Sample

Forefoot Energy Return Locked Lock%

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Heel Compression Energy Return

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Nike Alphafly 4 Heel Energy Return Sample

Heel Energy Return Locked Lock%

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Stability

External Shape

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Nike Alphafly 4 3D Model Full Shoe Sample

Outsole Heel Width Locked Lock mm (Lock")

Outsole Arch Width Locked Lock mm (Lock")

Outsole Forefoot Width Locked Lock mm (Lock")

Heel Width-To-Stack Ratio Locked Lock

Forefoot Width-To-Stack Ratio Locked Lock

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Heel Firmness

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Nike Alphafly 4 Heel Firmness Graph Sample

Firmness At 550N Locked Lock N/mm

Firmness At 1100N Locked Lock N/mm

Firmness At 1900N Locked Lock N/mm

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Forefoot Firmness

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Nike Alphafly 4 Forefoot Firmness Graph Sample

Firmness At 800N Locked Lock N/mm

Firmness At 1300N Locked Lock N/mm

Firmness At 2050N Locked Lock N/mm

Other Features

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Nike Alphafly 4 Other Features Photo Sample

Tongue Gusset Type Locked Locked

Plate Locked Locked

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Cushioning

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Heel Cushioning

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Energy Absorbed At 550N Locked Lock J

Energy Absorbed At 1100N Locked Lock J

Energy Absorbed At 1900N Locked Lock J

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Forefoot Cushioning

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Nike Alphafly 4 Forefoot Cushioning Sample

Energy Absorbed At 800N Locked Lock J

Energy Absorbed At 1300N Locked Lock J

Energy Absorbed At 2050N Locked Lock J

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Forefoot Long Run Cushioning

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Nike Alphafly 4 Forefoot Long Run Cushioning Sample

Energy Absorbed At 10km Locked Lock J

Energy Absorbed At 20km Locked Lock J

Energy Absorbed At 30km Locked Lock J

Energy Absorbed At 40km Locked Lock J

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Wet & Warm Weather

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Breathability

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Nike Alphafly 4 Upper Microscope Photo Sample

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Time-To-Dry

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Nike Alphafly 4 Time-To-Dry Graph Sample

Time To 30% Dry Locked Lock hrs

Time To 70% Dry Locked Lock hrs

Time To Dry Locked Lock hrs

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Water Absorption

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Water Absorbed Locked Lock%

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Bounciness

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Heel Compression Depth

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Nike Alphafly 4 Heel Compression Graph Sample

Heel Compression At 550N Locked Lock mm

Heel Compression At 1100N Locked Lock mm

Heel Compression At 1900N Locked Lock mm

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Forefoot Compression Depth

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Nike Alphafly 4 Forefoot Compression Graph Sample

Forefoot Compression At 800N Locked Lock mm

Forefoot Compression At 1300N Locked Lock mm

Forefoot Compression At 2050N Locked Lock mm

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Snappiness

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Forefoot Bending Energy Return

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Nike Alphafly 4 Forefoot Bending Energy Return Sample

Forefoot Bending Energy Return Locked Lock%

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Forefoot Bending Stiffness

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Nike Alphafly 4 Forefoot Bending Resistance Sample

Forefoot Bending Stiffness Locked Lock N/mm

Forefoot Bending Force Locked Lock N

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Forefoot Rocker Geometry

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Nike Alphafly 4 Forefoot Rocker Photo Sample

Toe Spring Locked Lock mm (Lock")

Toe Apex Position Locked Lock%

Forefoot Rocker Angle Locked Lock°

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Roll

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Rocker Stiffness

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Nike Alphafly 4 Forefoot Rocker Stiffness Graph Sample

Force To Flatten The Rocker Locked Lock N

Stack Heights

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Nike Alphafly 4 Stack Height Photo Sample

Heel Stack Height Locked Lock mm

Forefoot Stack Height Locked Lock mm

Heel-To-Toe Drop Locked Lock mm

Advertised Heel-To-Toe Drop Locked Lock mm

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Heel Rocker Geometry

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Nike Alphafly 4 Heel Rocker Photo Sample

Heel Spring Locked Lock mm (Lock")

Heel Apex Position Locked Lock%

Heel Rocker Angle Locked Lock°

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True To Size

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Length Fit

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Nike Alphafly 4 Toe Clearance Photo Sample

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Forefoot Fit: Width

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Nike Alphafly 4 Forefoot Width Photo Sample

Ball-Of-Foot TTS Deviation Locked Lock mm (Lock")

Toe TTS Deviation Locked Lock mm (Lock")

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Arch Fit: Width

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Arch Width TTS Deviation Locked Lock mm (Lock")

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Forefoot Fit: Height

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Nike Alphafly 4 Forefoot Height Photo Sample

Toe TTS Deviation Locked Lock mm (Lock")

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