[SPACE SAVING]In addition to foldable arms, this desk chair features a folding backrest function. When you don't need to sit down, the chair can be folded up to leave most space. How to fold the back: Step 1 is to press the buttons on both sides with your thumbs and Step 2 is to fold the backrest with other fingers[MESH LUMBAR SUPPORT]Equipped with a lumbar support design that is a double-layer back, the computer chair provides very comfortable support to the user. The mesh material of the backrest lets air through to your back during long sitting periods[WIDENED SEAT]The width of the seat is 52 cm. The cushion-resistant to abrasion and deformation, with suitable elasticity, giving you a comfortable experience, very suitable for long-term office use, and avoid fatigue[DURABLE & RELIABLE]The task office chair has been tested for office use and meets the requirements for durability and stability set forth in the following standards: EN 1335 and ANSI/BIFMA x5.1.. Mesh with good support, high-density backrest frame material, chair legs that can stand 1136kg strength, 35mm thickened mechanism, HOLLUDLE does it all[5 YEAR PARTS WARRANTY & EASY ASSEMBLE]This swivel office chair comes with a 5-year guarantee, longer than most other sellers because the chairs are made of high-quality material. And free return in 30 days, it is ok to change your mind. Moreover, it takes about 20 minutes to assemble it without pressure, check the user manual and assemble video show how to screw effectively srews , and feel free to contact us