Four kneading massage nodes in the lumbar area work with a wired controller that lets you select direction and timing, so you can target tension while you sit. The 29 x 30.5 x 47-51 in chair combines a curved backrest and removable 14 x 13 in lumbar cushion to support the spine, while the 11.5 x 6.5 in padded headrest adjusts in height and angle to fit different users. A thick 22 x 22 in waterfall seat with double cushions and resilient sponge distributes body weight for comfort, supporting up to 300 lbs. Soft padded armrests flip up to move closer to your desk or save space. A 15° rocking function, 19-23 in adjustable seat height, and 360° PU swivel casters help you find a comfortable position and move easily between tasks.