Fast-forward your run It’s always been fast. But now, it’s even more fun. Re-engineered with more cushioning, a softer underfoot feel, and a new, spoon-shaped Speedboard® to catapult you forward. The new Cloudflow 4 has everything you need to move like lightning. You wanted speed. On added a spoon-shaped nylon blend Speedboard® that's stiff, strong and lighter than before. Added to a powerful forward roll to catapult you to new personal bests. Put simply, you'll feel it. The ultra-light woven upper takes a cue from On's fastest shoe yet – the Cloudboom Echo. The result? Breathability and performance that makes picking up the pace easier than ever. CloudTec® in Helion™ dual-density superfoam now runs throughout the shoe. Impact is swallowed, meaning every stride is softer underfoot. What's more, it gives back an ultra-responsive running sensation. And that's crucial
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