On Cloudboom Max

On Cloudboom Max review: what runners say

Fit

True to size for most runners; some users with longer feet report sizing short compared to other On models, with resulting toe pressure.

Feel

Cushioning is present but muted: the PEBA foam is noticeable, but the fiberglass plate stiffens the system and dulls energy return. No appreciable rocker, no pop at toe-off.

Durability

Generous rubber coverage at heel and forefoot; sources indicate good wear resistance, with no precise mileage estimate.

Best for

Designed for marathoners in the 4:00–5:00 hour range. In practice, the high weight (298–315 g) and stiffness make it questionable even for that bracket over full race distances.

Weak points

Excessive weight for a race shoe (298–315 g depending on size). Ride is stiff and locked-down due to the fiberglass plate. Some units show frayed stitching in the upper causing abrasions; one tester had to cut a long run short from 15 to 10 miles due to pain.

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