Unsurpassed up-to-the-minute ergonomic design arrives in the form of the self adjusting spaceflex back chair with self adjusting mechanism. Intelligently outfitted with a firm yet flexiable cut out style contoured back, the backrest of this ingenuitive seating solution provides for optimal support while sporting cutting edge style. Brilliantly constructed with a thickly padded 2-layer mesh seat and engineered with pressurized seat height adjustment, the easily adjustable seat wicks away moisture and allows for quick and simple seat positioning. The genius tilt tension function allows you to recline with prefect balance and support while also providing an anti-kickback functionality when arising from a seated position. Height adjustable padded arms allow for a place to rest your hardworking hands and a heavy duty base with dual wheel carpet casters allow you to glide effortlessly from desk to printer. Combine all these features with the eco-friendly GreenGuard certification and you have a perfect work chair that is destined to be the office favorite for years to come.Thick padded two-layer mesh seatPneumatic seat height adjustmentSelf adjustable mechanism adjusts tilt tension by using your body weightCounter-balance resulting in perfect balance as you reclineMechanism also features backrest lock and anti-kickbackHeight adjustable armsColor: Raven back/raven mesh seatMaterials: Mesh, foam, plastic, metalWeight capacity: 250 poundsModel: 86-M33BN2WDimensions:Seat height: 18.25-22.5Seat dimensions: 19.25 wide x 19.5 inches deep x 4.5 inches thickBack dimensions: 21 x 19 inches highDimensions (overall): 27.25 inches wide x 24 inches deep x 44 inches highAssembly RequiredPlease note: Orders of Four (4) or more chairs will be shipped via Freight carrier, are not traceable via UPS, and our Oversized Item Delivery/Return policy will apply. Please allow 10 days before contacting Overstock.com regarding any freight carrier shipping concerns. Please click here for more information.