The principal scope of this master thesis is to investigate some design guidelines to apply for available side airbag (SAB), aiming at improving its performance during a side impact crash, in particular a pole crash that is greatly severe due to a punctual high impact force against car. The main biomechanical parameters that have been considered are the force loading on shoulder (shoulder force), and the deflection imposed on thorax ribs during the intrusion of the panel, mostly the first rib (top rib compression). According to norm ECE R-135 these values must not be over 3 kN, for shoulder force, and 55 mm for top rib compression.