Big and Tall office chairs are designed to accommodate larger and taller body types. This chair has been tested to hold a capacity of up to 400 lbs., offering a broader seat and back width. The adjustable height back extends to the upper back for greater lumbar support. The locking back angle adjustment lever changes the angle of your torso to reduce disc pressure. Chair easily swivels 360 degrees to get the maximum use of your workspace without strain. The pneumatic adjustment lever will allow you to easily adjust the seat to your desired height. The heavy duty steel base is constructed to withstand daily use.