Big & Tall office chairs are designed to accommodate larger and taller body types. This chair has been tested to hold a capacity of up to 500 lbs., offering a broader seat and back width. High back office chairs have backs extending to the upper back for greater support. The high back design relieves tension in the lower back, preventing long term strain. The breathable mesh material allows air to circulate to keep you cool while sitting. The contoured backrest features a knob to adjust the firmness provided to your back. The contoured seat dissipates pressure points for greater comfort. The waterfall front seat edge removes pressure from the lower legs and improves circulation. 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 flip-up arms are great for users who like the option of an armless chair without the hassle of detaching them. The heavy duty metal base is constructed to withstand daily use.