This is the shoe for the day the clock actually matters. The Cloudboom Strike 2 is On's carbon-plated racer, light, sharp and relentless, built to help you hold a hard pace from the gun to the line.
And it's a big step on from the original Cloudboom Strike. The Helion HF foam has been re-worked to run 15% lighter and 6% more resilient, so there's more spring for less weight. The carbon-fibre Speedboard is now both stiffer and lighter for a snappier, more propulsive toe-off. And a brand-new CloudTec Sphere cushioning under the forefoot expands in every direction on impact, so those long, fast kilometres feel smooth instead of punishing.
The upper is new too, an open leno weave that's barely there, breathing hard and shedding heat, while a carbon nanotube rubber outsole grips when you're really pushing. Interval reps, threshold work, marathon race day, this is the one you save for when you mean it.
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