How effective is conductive fabric for EMI / RFI shielding?

To help your product meet EMC, conductive fabric can be very effective at blocking EMI.  An electrically conductive polyester fabric. The combination of Nickel & Copper (Ni/Cu) woven metal fibres provides excellent conductivity and shielding effectiveness (>80dB) over 100KHz to 1GHz frequency range. The material is available as a fabric or wrapped around a low compression force PU foam as a gasket, with or without an adhesive.