The Callista is a unique chair that allows you to switch quickly between an active and a passive posture. In the active mode the seat is tilted forward which tilts the pelvis which gives one a perfect seating position. In the passive mode, the lumbar support and special ergonomic designed seat provide a correct position of the spine. The Callista can be adjusted to your optimal seating position. The pressure of the lumbar support is adjustable. The base is made of polished aluminum with large wheels for easy movement. The Callista is standard upholstered with Stamskin which is water-repellent and easy to maintain.