In recent years, pollution caused by destructive and harmful electromagnetic (EM) waves has increased due to the ever-increasing use of electronic devices. Therefore, it is essential to protect the human body from the EM waves that have harmful effects on the environment and human beings. EM shielding can be achieved by three mechanisms: reflection, absorption, and multiple reflections. In this research, different polyester nonwovens with high shielding efficiency (SE) were produced concerning the effect of EM shielding material and production methods. For this purpose, two ways for the production of the EM shielding layer were used. First, three absorbing layers were prepared using the coating technique, including two samples containing carbon black of different thickness on one side and a third containing carbon black on both sides. As a second, several numbers of reflective layers were coated using the laminate technique from aluminum and nickel sheets. In addition, two reflective layers containing different weight fractions of aluminum microparticles were prepared by coating technique. Furthermore, a reflective layer containing aluminum was prepared by vapor deposition under vacuum conditions and was further bonded to the polyester nonwoven using the laminating method. The samples were characterized by measuring the shielding effectiveness, thickness, areal density, electrical resistance, and air permeability. The experimental results of the first method showed that the SE values increase with increasing thickness, and the sample containing carbon black with a thickness of 1 mm on both sides showed SE of 15 dB in the frequency range of 8-12 GHz. In the second method, the results showed that a continuous layer strongly influences the SE, while the effect of thickness could be ignored. The samples containing aluminum and nickel sheets showed a SE of 70 . Based on the findings, a hybrid sample made of an absorbing layer and a reflective layer was proposed as a perfect layer in the shielding mechanism.