Operational chair that provides maximum customization in terms of ergonomics. The backrest has a nylon frame to which a breathable and flexible polyester mesh is attached, giving transparency. The lumbar support is made of polypropylene and can be upholstered with the same fabric as the seat. A synchronized self-weighting mechanism, which independently adjusts the intensity of oscillation according to the user’s body weight, ensures adaptability and extreme comfort. The armrests are adjustable in height, depth, width and swivel to suit its user. The swivel base made of die-cast aluminum is adjustable in height.