GB/T 2 2890.2 - 2024 "Leather, soft leather - Determination of water resistance performance, Part 2: Repeated angle compression method (Metzer method) " specifies the test method for determining the dynamic water resistance performance of leather by repeated angle compression method using a Metzer type testing machine. It is suitable for the determination of water resistance performance of various types of soft leather, especially soft leather for shoes. The standard describes in detail the principle of the test, equipment, sample preparation, wear simulation pretreatment, test procedure, calculation and representation of results, and test report, providing a standardized test procedure for the evaluation of leather water resistance performance.