The Wellness By Design Mesh Back Office Chair has adjustable features and offers premium comfort and support. Height adjustable armrests allow the user to raise or lower the arm’s optimal height to help prevent shoulder strain. The chair includes seat sliding and height adjustment functions that allow you to customize the seat depth and height so your knees are at a 90-degree angle for proper circulation. The tension adjusts knob controls the amount of pressure needed to recline the seatback. Tilt-lock allows the seat to recline or remain locked in place for your own personal comfort. The supportive headrest is optional and the users can decide assembly by themselves. Whether it’s in your home office or cubicle or commercial workspace, the Wellness By Design Mesh Office Chair makes a great fit.