This thesis project has its origin in a customer’s company request that ask to evaluate the structural performance of a Retractable Hard Top Cover frame of a spider sport car and, in particular, to analyze its structural frame made of Aluminum and to design a new alternative structure, realized in carbon fiber composite material, evaluating the possible performance advantages. Although this kind of component could seems a trivial case of study, in reality there are many different aspects and situations that must be taken into account. In particular, the Retractable Hard Top is responsible not only of the structural integrity of the esthetical external body shell but it has to withstand some different situations: •??It must resist to aerodynamics loads both in its closed and opened position.