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Buyer's Guide

On Running Cloudboom Max Review & Sizing Guide

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A 2025 plated long-run trainer-racer with a dual-density Helion HF midsole and glass-fiber plate, the Cloudboom Max suits stability-seeking marathoners but gives little push at faster paces.

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Key facts

Popularity
Discussed widely as a stability-focused everyday marathon option
Comfort
Firm, stable, protective ride for long mileage
Fit
True to size, standard width, runs slightly wide for On
Value
Premium price hard to justify if you want race-day pop
Use case
Long runs and marathon pacing for 4-6 hour finishers

Full breakdown

On built the Cloudboom Max in 2025 as the supportive sibling to its Cloudboom Strike racer, joining a wave of brands making plated, race-styled shoes aimed at ordinary marathoners instead of elites. The dual-density Helion HF midsole and glass-fiber plate are tuned for stability over snap, placing it in the long-run and marathon-pacing lane rather than pure race day.

FAQ

Is the Cloudboom Max comfortable for long runs?

Buy it if you want firm stability rather than a soft, cradling ride underfoot. Believe in the Run describes the dual-density Helion HF foam and glass-fiber Speedboard, and an owner logging 45km called the ride firm and very stable on easy efforts. Heel strikers get the most comfort and reward from the rocker geometry.

How is the Cloudboom Max different from the On Cloudboom Strike?

Choose the Strike if you want the lighter, sharper race-day shoe; choose the Max for stable, controlled long runs. Believe in the Run places the Max near the Strike on foam but differently tuned with a glass-fiber plate, so for daily long-run comfort the Max fits better while the Strike fits race day.

Does the Cloudboom Max give good energy return at marathon pace?

Not for faster runners, so buy it only if your goal pace is relaxed. One owner found it fine on easy efforts but said that at marathon pace he was doing all the work with nothing in return. It best suits 4-6 hour marathoners who value stable comfort over propulsion.

Who should avoid the Cloudboom Max?

Skip it if you want the lightest race-day shoe or the bounciest PEBA feel. At around 296g it is heavy for a plated racer, and r/RunningShoeGeeks runners questioned why a pure race foam shoe weighs so much. Faster runners chasing maximum pop should compare the Cloudboom Strike, Vaporfly, or SuperComp Elite first.