Back Type : High Back Back Material : Nylon (A Grade) Back Upholstery : Original Korean Mesh Headrest : 4 Way Adjustable Armrest : 3D Adjustable Armrest Functionality : Up/Down, Front/Back, In/Out Seat Cushion : 55 Density Premium PU Moulded Cushion Seat Fabric : Poplin Cotton Lumber Support : Height adjustable Lumbar support Mechanism : Slider Synchro Mechanism Mechanism Tilt Type : Synchro 3:1 Mechanism Lock Type : Multiple Angle Locking System (90-135 Degree) Gaslift : BIFMA Level 5 Base : Solid Steel Base (1200 KG Tested) Wheel : Nylon Alloy Special Feature 1 : Seat Depth Adjustment Special Feature 2 : Close Neck Support Ideal User's Height Reference : 5'2"-6'0" Ideal User's Weight Reference : 60-130kg