Which of the following is NOT true about thermal cork?

The statement that thermal cork is rigid and inflexible is not true because thermal cork is known for its ability to provide comfort and cushioning, which is often due to its flexibility and adaptability to foot shape. This flexibility allows it to mold to the curvature and contours of the foot, enhancing fit and support while reducing pressure points. The lightweight nature of thermal cork and its combination with other materials, such as rubber, further enhances its usability in therapeutic shoe fittings, making it suitable for personalized comfort. Therefore, the characteristic of being rigid and inflexible does not align with the properties typically associated with thermal cork.