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The acoustic comfort inside the vehicle justifies important attention during its development phase, because customers desire a quiet interior to have a more relaxing environment, easier to have conversations and to listen to the radio. Generally, acoustic insulators are distributed on vehicle body to minimize the portion of noise that enters the vehicle and, in the interior, absorber components are used to reduce the cabin noise reverberation. Internal noise absorption is mainly performed by headliners, carpets and seats. In order to contribute to the sound absorption inside the vehicle made through the seats and to propose a foam and fabric configuration that demonstrates the best acoustic performance, this work aims to compare combinations of three different foam densities with eight different fabrics using the Kundt´s tube.