This standard Ergonomic Chair has a seat height adjustment control system. You can also adjust the height of the backrest, head support and armrests (vertically). The seat can be adjusted in its depth. The lumbar support has a nylon base a double twist roller caster. Seat with non-deformable injected foam Adjustment of recline tension based on the weight of the user Soft armrests to the touch Gel type. It has a one-year warranty against manufacturing defects.