The Upper Material Flexing Tester is specifically designed for assessing the flexing resistance and physical durability of vamps and soft materials used in footwear. This tester simulates walking conditions to evaluate the specimen. Noteworthy features include memory and return functions, allowing users to customize the number of tests. The equipment aligns with the ISO-4643 standard for molded plastic footwear, particularly focusing on lined or unlined poly (vinyl chloride) boots intended for general industrial use. The standard specifies requirements, physical properties, and marking criteria, covering aspects such as thickness measurement, resistance to flexing of the upper material, flexing tests for soling material, and boot heights.