This study focuses on the analysis of composite skins made from carbon fiber, glass fiber, and aramid, materials commonly used in sandwich structures for marine applications. These composites are employed in both recreational boats and competitive racing vessels. The primary objective of the research was to evaluate the mechanical performance of these composites through tensile testing. The composite skins were modeled in a dog-bone shape, a geometry chosen to optimize stress distribution during experimental testing. Tensile tests were conducted to determine mechanical properties such as tensile strength, modulus of elasticity, and fracture strain. The data collected from these experimental tests were crucial for the subsequent modeling phase. Using the experimental results, a FEM (Finite Element Method) model for the composite skins was developed and validated. This numerical model allowed for the simulation of the mechanical behavior of the materials under various loading conditions, providing a deeper understanding of their structural performance. The validation of the FEM model was essential to ensure the accuracy of the simulations and to predict the behavior of the composites in real-world applications. The findings from this study offer significant contributions to the marine industry, suggesting possible improvements in the design and production of boats. The use of validated FEM models can lead to greater efficiency in the design phase, reducing costs while enhancing the safety and durability of the vessels. In conclusion, the research demonstrated the effectiveness of carbon fiber, glass fiber, and aramid composite skins for marine applications, highlighting how the combination of experimental testing and FEM modeling can significantly improve the understanding and optimization of composite structures.