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The Cloudboom Strike LS is On's ultralight marathon racer, built around a lace-free LightSpray upper that weighs about 30g and a dual-layer Helion HF foam midsole over a spoon-shaped carbon Speedboard. At roughly 170g with a 39.5mm heel stack and 4mm drop, it sits among the lightest carbon-plated racers and is aimed at athletes chasing fast times over half marathon to marathon. The seamless sprayed upper is the headline: no laces, a second-skin fit, and a lower-emission build. Rivals like the Nike Alphafly and Adidas Adios Pro offer more conventional lacing and, in the Alphafly's case, a higher-stack, bouncier ride; the On trades some adjustability and everyday comfort for minimal weight and a firm, propulsive feel. Reviewers praise the weight and turnover but note the snug, non-adjustable fit and the price of a race-day-only shoe.
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Runners who race in the Cloudboom Strike LS praise its low weight and the springy, rolling turnover from the plate and foam. The lace-free upper draws divided opinion: some love the locked-in second-skin feel, others find it tight and hard to adjust. Most agree it is a fast race-day tool rather than an everyday trainer.
The On Cloudboom Strike LS is a unisex, carbon-plated racing shoe. It has a seamless LightSpray upper made from a single filament. The upper uses just 30g of material and has no laces.
The midsole has two layers of Helion HF hyper foam, which is over 40% bio-based. A spoon-shaped carbon Speedboard sits in the midsole for energy transfer and propulsion. The shoe has no sockliner, which allows more foam and less weight. The rubber outsole has increased ground contact zones for traction.
It is made for marathons, half-marathons and high-intensity racing.
