WorkPro Commercial Leather Executive Chair, Black Includes a cable control mechanism with seat slider to customize for optimum comfort. Posture lock keeps the seat in the proper position for your back and legs Recommended for intensive use 68 hours per day. Adjustable seat back depth lets you adjust the chair to support your knees, alleviating strain. Offers 1-touch seat-height adjustment so you can find the perfect position for your back. Also includes tilt tension and adjustable tilt angle to keep you comfortable throughout the workday.