Ergonomic mid back task chair combines a cushioned backrest and padded arms to support your upper body while you work. Leathaire upholstery wraps soft sponge and resilient pocket springs, so the 18.5 x 20 x 5 in seat cushion and 19 x 17 in back cushion stay comfortable through long sessions. A lever lets you raise the seat from 20-22.5 in and engage a 90°-105° rocking function, while a handle adjusts rocking tension. The metal 5-claw base and plywood support hold up to 330 lbs and roll on quiet PU casters for easy movement.