Hyosung, The Lycra Company and Yulex are pouring millions into bio-based elastane made from sugarcane, corn and rubber - and counting on progress, not perfection, to solve fashion's stretch problem.

Hyosung, the world’s largest producer of spandex by market share, leaned into sustainable stretch with its bio-based spandex made from dent corn feedstock. Ever since, it has been aiming to increase ...