As 3D content pipelines expand to serve diverse applications in AR, VR, gaming, and the industrial metaverse, material definitions have become a critical focus for achieving asset interoperability, to make content once and use it everywhere. This panel, featuring members of the Khronos Group and the Metaverse Standards Forum, explores the evolving role of materials in bridging formats like glTF and USD. Experts will discuss the adoption and integration of technologies like MaterialX and OpenPBR to ensure consistent visual fidelity and streamlined workflows across tools and platforms. Attendees will gain insights into the challenges of standardizing material properties, the collaborative efforts underway to address them, and the roadmap for enabling a unified material ecosystem.