Hon company Mid-Back Pneumatic Chair Mid-back Pneumatic Chair features pneumatic seat height adjustment, back height adjustment, seat glide, swivel, tilt tension, and variable synchro tilt. Adjustable arms provide added support. Variable synchro-tilt control adjusts back recline at a 2-1 ratio to the seat; tilt moves freely or locks in five positions. Forward angle control provides an extra five degrees in range of motion. Seat glide mechanism moves seat forward or back from the work at hand, then locks into position. Convenient adjustable back height positions lumbar support at the proper height for each user. Comfortable memory foam in the seat cushion remembers its shape once body pressure is released.