DXRacer Boss Series Big and Tall Chair DOH/BE120/NW Office Chair Comfortable Ergonomic Computer Chair DX Racer Desk chair (Black/White) Ergonomic design-- more efficiently and comfortably, Free bonus: lumbar cushion Wider seat, Patent race car seat breathable material: Leather Style Vinyl Extra higher backrest to save neck and spinal,Flexible seat back with adjustment 3D straight armrests protect shoulders and wrists Wide Aluminum Base with 3" casters, Heavy Duty Tilt Mechanism