The seat is the story: 25 inches wide by 20 inches deep and shaped into a U, so both knees fold inside the cushion rather than hanging over an edge. High-density sponge fills it, and PU leather over the top wipes clean and resists scuffing from belt buckles and zippers. A 23 by 14 inch backrest supports the lower half of the spine without towering over the shoulders. Height covers 5 inches of travel, an 18 to 23 inch seat range, and a built-in rocking mechanism plus 360 degree swivel keep the posture from locking up. The cross-shaped metal base leaves 20.5 inches between opposing legs and carries 330 lbs. Assembled size is 27.5 inches square by 30 to 35 inches tall, weight 27 lbs.