Optimum positioning The Heron can change the back height and add a couple of simple accessories to change seat width and seat depth. Perfect working conditions One of the great features of the Heron is the hydraulic or powered height adjustment which allows you to adjust the chair into the correct position. Pressure mapping has been used in the design of Heron to minimise pressure. Heron is available as a hydraulic (100 kg) or power version (130kg)