EMF Shielding Mattress Bed Sheet Protection against LF radiation, Size: 100 x 200cm, Colour: Gray/Brown Comfortable and soft fabric. Needed to be grounded in order to achive earthing and higher shielding effectivness Raw materials: 48 % cotton, 36 % polyester, 14 % silver, 2 % elastan Surface conductivity: 20.0 ohm (square resistance)