An S-shaped backrest on this office chair follows the spine through its double curve, relieving pressure at the waist that a flat panel concentrates. Rocking runs through a modest 0 to 18 degrees, enough to shift position during a long meeting without reclining out of it. Seat height adjusts from 18 to 23 in on an SGS gas rod, PU leather over high-density sponge wipes clean, and the base carries 330 lbs.