1. Generally there are two kinds of materials, one is wrapped in stainless steel filaments outside the cotton yarn, breathable, wash-resistant, due to the small resistance of the metal wire, can be shielded to absorb electromagnetic waves.
2. The other is plated on the surface of the cloth with conductive wave-absorbing metal ions. This material radiation performance up to 60dB, but the breathability of some poor washing resistance, both materials are widely used in foreign countries.