This chair was improved ergonomically in many ways. First his surface is rubbish type and its really comfortable to sit on, and it will be comfortable to sit on it for a few working hours. Second the arms of the chair are added, which makes it really easy and comfortable to rest your palms on it. And third the wheels, you can no longer drag the chair you can just ride it through office and not apply any additional force or lift it at all!
*Jasons*Examples of Ergonomically Improved items