GB/T 3903.4-2008 "Footwear, General Test Method Hardness", formulated for footwear product Hardness testing. The standard stipulates the general method of footwear hardness testing, clarifies the test principle, equipment and instruments, covering sample preparation, test process and result calculation. It is suitable for different parts of various types of shoes. Through standardized testing, the Hardness of footwear materials can be accurately measured, providing a key basis for footwear design, production material selection and mass control, and ensuring that the comfort and durability of footwear products meet the requirements.