In absence of vibration,seat comfort depends only on static and time factors. The static seat comfort is mainly dictated by the seat cushion, and can be increased by avoiding high contact pressure areas at the human seat interface. Time factors take into account the discomfort that appears after prolonged sitting due to fatigue.Dynamic factors represent the discomfort caused by exposure to vibration, and increase with the vibration magnitude.Dynamic comfort can be improved by using a seat that attenuates whole-body vibrations transmitted to the operators.