Ergonomic design for long-lasting comfort. Give your lumbar great support, alleviate the back pain that can result from long working hours, 90-135 degrees tilt angle, tilt tension lock by wire control, a tilt-tension knob makes it easier or harder to rock back in your chair, and easily lying down to have a nap, 360 degrees swivel flexible to adjust your favorite position. Widely apply to workplaces like home, office, conference room, and reception rooms. Product Details Swivel: Yes Lumbar Support: Yes Tilt Mechanism: Yes Seat Height Adjustment: Yes ANSI/BIFMA X5.1 Office Seating: Yes Weight Capacity: 300 lb. Armed Armrest Type: Adjustable Back Angle Adjustment Locking Back Angle Adjustment: Yes