A good office chair should meet the following standards: it must have a height-adjustable device and a flexible 360-degree swivel basic function. The depth and width dimensions of the seat should be correct, and the front edge of the chair should be curved downwards. Additionally, it should be made of breathable fabric with good support for the body, eliminating fatigue and tension. The backrest should be designed to fit the curve of the human waist to prevent the lumbar vertebrae from becoming arched, thus protecting the lumbar vertebrae. OC-9006A meets these standards.