The On Cloudboom Strike 2 arrives as a complete redesign of the brand’s flagship racing shoe, and early reviews suggest the changes deliver on performance without the usual trade-offs of a generational overhaul.
A midsole and Speedboard reimagined
The most noticeable difference lies in the midsole. The Helion HF foam, carried over from the previous model, is now 15% lighter and retains its responsiveness while resisting compression better. But the real shift comes from the new CloudTec Sphere geometry and a firmer, more propulsive Speedboard.
Gone are the signature “pods” that defined On’s soles for years. Instead, flexible gaps in the front and rear allow for a more natural foot motion while the curved carbon Speedboard adds structure. The result, according to testers, is a ride that feels fast and stable—unlike many supershoes that force runners onto their forefeet.
Fit and comfort: a mixed bag
The mesh upper is more breathable than the previous generation, though some testers describe the texture as unusually stiff—comparing it to the screens used in summer camp cabins. Once the shoes are on, the sensation fades, and the material proves easy to clean.
The lacing system and heel lock have been refined, with an extra hole to secure narrow heels. The collar sits lower than in many racing shoes, reducing the risk of rubbing. Still, fit varies. One tester with a wider right foot initially felt the insole compress rather than the shoe itself, though the issue lessened after a break-in period.
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This shoe does have a lowe
Performance on the road
Early impressions from Runner’s World editors highlight the shoe’s speed and stability. One tester, training for multiple fall races, called it a potential go-to for upcoming events, praising its lightness and bounce without the wobble common in other supershoes.
Another editor, who ran the shoes during a half-marathon cycle, described them as “super light, bouncy, and fast,” though noted the initial fit quirks for wider feet. Both agreed the break-in period helps, a rare advantage in a category where shoes often prioritize immediate performance over adaptability.
If the Cloudboom Strike 2 has a weakness, it’s the upper’s unconventional texture, which might deter runners sensitive to tactile oddities. But for those willing to overlook it, the shoe offers a distinct alternative to the carbon-plated mainstream.
The redesign risks alienating fans of On’s classic pod design, but the gamble appears to pay off.
