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Selection of material is a crucial part of the voyage of obtaining the optimal product. The task is challenging for the designer who has to select the optimal material from a list of thousands of materials that satisfy the tangible and intangible criteria. The problem of identification of the optimum material can be solved using different MCDM (multi-criteria decision-making) tools. This chapter proposes to select the optimal material for polymeric composite bumper beam using TODIM (tomada de decisao interativa multicriterio, which means in Portuguese “interactive and multi-criteria decision-making”) method. Six different composite materials were considered. Glass fiber epoxy turns out to be the optimal material for the bumper beam. Further, finite element analysis was carried out to study the behavior of the candidate materials under specific loading conditions.