We make these pouches to order. We use a double layer of faraday material inside the layers of fabric which make the pouch. There is a fold over velcro fastening because it is important that there are no gaps. We take care when sewing too to reduce needle holes in the fabric. The pouches are tested and no phone signal reaches when it is inside the bag and recommended to use at night too so that no emf frequencies are emitted during sleep hours. We also make computer bags too to take one or more devices so that you are more protected at night. Because even when switched off, with a live battery they still emit and can receive.