The hydropneumatic bellows chair consists of the elastic shell 1, which forms a variable volume chamber protected outwards by a metal cylinder 2. The shell 1 is fixed to the bottom between flange 3 and cylinder 4, where the damping fluid is introduced. Through the valve 8 is inserted at the commissioning of the seat, low pressure air (0.3 ... 0.7 bar) according to the driver's weight.