Black mesh back with breathable Black mesh fabric seatPneumatic seat height adjustmentHeight adjustable armsMulti-function mechanism with seat depth adjustmentBack angle adjustmentForward tilt mechanismSeat slider mechanismInfinite seat tilt lock with tilt tension adjustmentHeight and depth adjustable lumbar supportScuff resistant arched molded base with twin wheel carpet casters Soft casters (OTG10700) are availableDimensions: 26w x 27d x 39.5hSeat Height: 17.5" - 21.5"Seat Width: 20"Seat Depth: 18.5"Back Height: 20"Back Width: 19.5"Arm Height Above Seat: 8" - 11.5"