Allbirds launched SweetFoam earlier this year in a line of flip-flops; it plans to start using the material across its entire product line soon—including its popular wool sneakers, which have sold more than 1 million pairs since their 2016 debut. And in an effort to encourage its competitors to follow suit, the San Francisco–based company has made the technical know-how behind SweetFoam “available to anyone who wants it, without question,” says co-founder Joey Zwillinger.