The University of Leeds and Rheon Labs Limited KTP 23_24 R6

Sports bras are about to get a material upgrade that could finally make them comfortable enough to wear for a full run. Rheon Labs and the University of Leeds are scaling up a new type of fibre that changes its stiffness in response to movement. The material, called RHEON Fibre, is soft and flexible at rest but stiffens under sudden force—meaning a sports bra made from it could provide firm support during high-impact activity while remaining comfortable when standing still. Current sports bras typically compromise between support and comfort, often relying on rigid underwires or thick padding that restricts natural movement. If the project succeeds, the fibre will move from lab-scale production to commercial manufacturing, making dynamic-support apparel widely available. The immediate impact is on athletic wear, but the underlying material technology—a fibre that adapts its mechanical properties in real time—could eventually be applied to other clothing or equipment where variable support is useful, such as medical braces or protective gear. For now, the focus is on getting the fibre into sports bras at scale.