The office executive chair adopts ergonomically designed S-shaped backrest and lumbar support, perfectly fit your body line and provide the best comfort for your back. The high quality wheels can rotate 360°freely and slide fluently on any type of floor. Designed with humanized adjustment features to help you find the most comfortable sitting posture, allowing you to sit for a long time and stay relaxed. Adjustable seat height and swing range, bring you a customized seating experience. Stay cool and comfortable with a breathable backrest that allow better airflow. The built in mid-back ergonomic support targets the lower back, reducing strain and preventing discomfort. The seat cushion is filled with a whole piece of high-density sponge, soft and strong to ensure minimum pressure on your hips and make you maintain a comfortable state. The sitting area is 51cm depth and 49cm width. You can easily assemble office desk chair by following the steps of the instructions. Pull up/down of the lever to adjust height of cushion; Pull in/out to lock backrest or turn on rocking mode, adjust the bottom knob to control the tightness of the backrest in rocking mode.