Comprehensive & ERGONOMIC. A comprehensive line of ergonomic seating with multiple adjustments for a wide range of activities. By supporting a more open angle between the hips and torso, VT does not restrict the circulation in the lower body, a major cause of muscle fatigue during extended work periods. The open angle along with the lumbar support relieves much of the tension on the lower back increasing comfort and productivity. VT is available in different sizes and with a variety of performance functions to suit people and their tasks.