In the midsole of their new Cloudprime running shoes, On will use CleanCloud ethylene vinyl acetate (EVA) foam made from carbon.

Foam derived from petroleum would typically be used to create that portion of the shoe.

This really adds to increased global carbon emissions during manufacture.

Beginning with a LanzaTech device that collects carbon monoxide gas emissions from sources like steel mills, CleanCloud foam is created.

This gas is then transformed into liquid ethanol using a patented fermentation method involving "specially selected and naturally occurring microbes."

The ethanol is then dehydrated by Technip, and Borealis polymerizes it to create tiny plastic pellets.

After that, On creates foam using those pellets.

When the Cloudprime running shoes will be sold commercially is presently unknown.