Modulax uses a ingenious mechanism with an even more ingenious foam. By means of a gasspring it is possible to adjust the back continuously. The back is completely foamed in a template wich follows the ergonomic contours of your back. The sitting part is identically foamed and offers the feeling of a seat which is used in the car sport. The quality of the used foam is of such a quality that we offer a quarantee of 3 years.