Sigma M Introduction：
Adjustable height of backrest
The backrest height adjustment allows you to raise and lower the backrest relative the seat. The backrest should be positioned so that the small of your back is comfortably supported by the backrests contoured lumbar.
Simple synchro Mechanism
Helps to improve circulation through more regular movements while seated. Allows the user to be more mobile during the seated work time, thereby reducing pressure on joints and muscles
Height adjustable armrest
Adjustable Armrest encourages you to keep elbows at a 90-degree angle. Doing so can take tension from your neck and shoulders, relieving you of annoying muscle aches at the end of a workday.
Moulded seat foam improves the comfort of any office chair and provides the best support. High durability, precisely and consistently shaped for optimum ergonomic support.