Deluxe chair features a special self-adjusting mechanism, breathable SpaceGrid back with adjustable lumbar support, and thick padded black mesh seat to maximize your comfort. The self-adjusting mechanism adjusts tilt tension by using your body weight as a counterbalance resulting in perfect balance as you recline. This convenient mechanism also features backrest lock and anti-kickback. Other functions include pneumatic seat-height adjustment from 17-3/4" to 22" , 360-degree swivel and tilt lock. Platinum-coated flip arms move back and out of the way. Arms are padded with PU pads to enhance your comfort. Heavy-duty, platinum-coated nylon base with endcaps is equipped with oversized, dual-wheel carpet casters for stability and easy mobility. Seat size is 20-3/4" wide x 20" deep x 4" thick. Back measures 22-1/2" wide x 28" high.