This makes it On’s first training shoe to feature LightSpray but far from the last. The company recently opened a new factory near Busan, South Korea, increasing its production capacity for the upper “30-fold,” it says.


It works like this: Robotic arms spray the upper onto a mold with single piece of synthetic monofilament — similar to how a spider weaves its web. Then the upper attaches to the midsole with a patent-pending thermal bonding technique.

The whole process takes mere minutes from start to finish, and it cuts down the carbon emissions up to 75 percent, On claims.

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