Lorell LLR81100 Multi-Task Chair- High-Back- 26-.88in.x26in.x39in.-42in.-.50in.- Gray Deep molded seat and back of this high-back multi-task chair provide added comfort. The chair also features pronounced lumbar support with 2 back height adjustment. Posture control allows for pneumatic seat-height adjustment (18-9/10 to 22-2/5 ), back height adjustment, seat depth adjustment, 360 degree swivel and asynchronous control. Adjustable height and width arms provide additional comfort. Chair is available in black frame only. Abrasion rating is 30, 000 cycles. The back measures 20-1/2 wide x 7 thick x 23 high.