Get extra comfortable in the Smilemart Adjustable Mesh Swivel Office Chair with Armrests. This easy assembly, sturdy office chair is perfect for long work days. In this rendition of our office chair, we have increased the seat size and cushion for optimal comfort. The small lever under the cushioned seat allows you to adjust and customize the chair to your perfect seat height. Featuring a densely knitted mesh backrest, this mesh office chair allows better airflow, accelerating heat and moisture dissipation. The mid-back design supports your spine’s natural curve and protects your lower and middle back as it prompts you to sit straight. The chair material is comprised of steel, iron, PP, nylon, mesh, foam, nonwoven fabric, and composite boards. The overall dimensions are 23.8″ L x 23.6″ W x (34.8-38.8)” H. The adjustable seat height ranges from 13.2″ to 17.1″ and the large seat size is 20.7″ L x 20″ W x 2.8″ H. Recommended user weight is under 100kgs. Our chair comes with a user manual, and please for your safety do not stand on this chair. This is a basic mesh chair, and the backrest is only for supporting your back while sitting. It is not suitable for people to lean back too far, otherwise, the backrest might be cracked.