Ergonomic Office Chair with Folding Backrest, Computer Office Chair with Folding Armrests, Mesh Lumbar Support and Tilt Function, Large and Tall Office Chair, White[Space saving] In addition to folding arms, this office chair has a folding backrest function. If you don't have to sit down, the chair can be folded 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 lumbar support design which is a double layer back, the computer chair provides very comfortable support to