The BALLY leather dynamic waterproof tester is used for the determination of water permeability and water absorption of shoe uppers. Mainly for the materials used in the upper: leather, artificial leather, cloth, etc., cut out the standard test piece, install it on the testing machine, under the condition of water in the periphery, bend at a standard speed and angle, and bend for a certain period of time. The penetration index of the material is measured and used as the basis for the research and development of improved waterproof processing of materials.