Drafting Chair Size : Adjustable gas rod height (minimum : 19.3 inch, maximum 27.2inch ). Mesh back surpport ( height : 25.2 inch, width : 19.3 inch ). Soft sponge seat ( width : 20.1 inch, length : 20.4 inch, height : 4 inch). Maximum load : 450 LB. Ergonomic office chair:This ergonomic desk chair has 3D lumbar adjustment (2 inches up and down,1.5 inches front and back) to ensure personalized lumbar support for users of different heights.The stool chair maintains correct posture and improves work efficiency.It is very suitable for people who work long hours. Soft Mesh Chair:The breathable mesh backrest of this tall office chair is woven with polyester material,which is soft and flexible.With a lifting table,it can be used as a standing desk chair,and the wide foot ring can fix the height,allowing your legs to relax.