Office Chair, Mid Back Mesh Ergonomic Home Office Desk Chair with Comfortable & Spacious Seat, Rocking-tilt Mechanism & Heavy Duty plastic Base (Black) Back COMFORT & MATERIAL: This office & study chair's back and thick molded foam seat with fabric material gives excellent support while also preventing heat and moisture build-up, keeping your entire body cool and comfortable. FIXED ARMRESTS: Fiber-based armrests that fully support appropriate posture and relax your arms. A heavy-duty metal foundation ensures durability and stability. It has been tested to hold up to 90 kg. TILT Motion: The rocking mode provides for more relaxation. To recline up to 135 degrees, draw the lever outwards. It can also be locked at 90 degrees by pushing it inwards. It's simpler to rock back in your chair with a tilt-tension knob beneath the seat.