Bay Materials is renowned for our Zendura A brand of polyurethane materials and its new Zendura FLX multilayer aligner material. FLX has launched an entirely new generation of clear aligner therapy. It is specially designed to answer the needs of clinicians and patients with improved tooth-moving properties while reducing the level of discomfort for the patient during use. Its unique 3-layer construction has set a new industry standard for quality and performance.