Ergonomic Office Chair with Adjustable Height Headrest Retractable Armrest Tilt Function High-back Executive Mesh Chair Breathable Rolling Swivel Chair Flip-up Arms Description: Our ergonomic office chair with adjustable height, headrest, and armrests offers superb stability and solid construction. Effectively relieves the pressure from back pains, and keeps you from sweaty and stuffy sitting experience. Features: BUILT TO LAST: Firm nylon base with solid metal construction, five-pointed feet design, anti-slack memory foam, and selected PA casters ensures durable and stable use. HEIGHT ADJUSTABLE: The height can be adjusted from 113cm/44.5" to 122cm/48" simply by pressing the lift lever. HEADREST&ARMREST: Adjustable headrest gives your neck reasonable support. The armrests can also be retracted for 90° to satisfy your needs. ROCKING MECHANISM: 90°-107°Adjustable. By loosening the tilt knob, the seat-back can slightly tilt with ease (unlockable) when you lean back and it springs back after you sit up. RELAX: Widened shoulder support offers full wrapping. 5 smooth casters allow rolling in all directions. Ergonomic backrest design fits well with the human-spine, and effectively relieves the pressure from back pains.  BREATHABLE: High-density memory foam provides a comfortable sitting experience without any stuffiness, and the high-elastic back mesh design frees you from sweats. Specifications: Item Name: Office Chair Material: Nylon+Foam+Metal Color: Black Max load: 136kg/300lbs Product Size:  Overall: 58.5*57*112-125cm/23*22.4*44.1-49.2" Detailed: Please refer to the image Package Size: 60*28*59cm/23.6*11*23.2" N.W: Approx.11kg/24.3lbs G.W: Approx.13kg/28.7lbs Notes: 1. Size information is just for reference only, please allow 1-2cm (0.4-0.8") differences due to manual measurement, thanks. 2. Item color displayed in photos may be showing slightly different on your monitor since monitors are not calibrated the same. Package List: 1* Office Chair