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This is a true road-racing flat in On’s stable of lightweight, zippy shoes. The Cloudflash lacks midsole foam, instead of relying on rubber pods under the foot to do all of the cushioning. Those are attached to the upper via a snappy plastic plate that delivers some structural integrity and responsiveness when you’re going fast. This combination left our wear-testers feeling the forefoot was still a little too thin and hard, even for race day. Efficient, speedy runners will like the snug fit and barely-there upper.
- Weight: Very Light | 7.6 oz
- Heel-To-Toe-Drop: Moderate | 9.0 mm
- Heel Height: Very High | 26.9 mm
- Heel Cushioning: Very Firm
- Forefoot Height: Very High | 17.9 mm
- Forefoot Cushioning: Very Firm
- Flexibility: Flexible
- Stability Features: Some
- Energy Return: More
We put each shoe through real-world usage and a battery of mechanical tests in our lab to provide you with objective — and exclusive — data. In addition to a shoe's weight, we measure sole thickness (everything that sits between your foot and the road), how well the foam cushions your stride, and the flexibility of the forefoot. All this is taken into account in our reviews of each shoe.
Technology
Explosive Speedboard™
Materials
Ultralight mesh
Design
For the most important seconds
On - Running Men Cloud Flash Shoes
- Cushioned landing, explosive take-off The 14 Cloud elements below the Cloudflash are shaped to transform and transfer more impact energy from the runner into fast, forward momentum.
- Speedboard The Cloudflash Speedboard, built from Pebax, is unparalleled in energy transition and fatigue resistance. It loads with impact energy to change toe-off to take-off at release.
- Impossibly light mesh The upper of the Cloudflash has one goal: deliver everything with nothing. Ultra-thin nano-mesh supported by a skeletal-structure work together to achieve impossible lightness.
- Secure fit Shaped like a race car seat, the performance heel-cap keeps your feet strapped in at high velocity. Accelerate in complete security.
- Heel cup shaped like a race car seat for a locked-in fit at high speeds.