This race chair has a higher backrest to support the entirety of your spinal column. And Our desk chairs offer a stable five-point base with a gas spring, allowing the use to adjust for varying heights to better meet the needs of your office or computer desk. Seat height: 17.7”-20.8”; Seat wide: 20.9”.Our office chair can satisfy all your daily needs. Ergonomically designed with highly ventilated mesh back, soft moderate sponge cushion will fit into your sitting position for a long time you won't feel tired. The bottom of the desk chair is equipped with a tension adjusting knob to provide a certain degree of tilt so that you can relax after work. The adjusting lever can help you adjust the height of the seat so that the chair can reach your ideal height.