Humanized Design: The rotation button can adjust the tilt angle of the chair, which is more convenient to use. Four lockable tilt tension wire mechanism allows you to have more choices at rest to tilt the chair. Feature allows you to tilt the backrest can be tilted rearward (90 ~ 120 ) or sit up. This office chair is larger than other chairs, and it can adapt to different body types. Stay Cool & Comfortable: High-density mesh pads provide all-day comfort and support. The high-quality mesh cloth is wear-resistant and anti-deformation, and the mesh backrest and mesh seat keep air circulation, making it more comfortable. You dont have to worry about sweating on your back and buttocks.