THEMIS products have special lining fabrics, which blocks depending of products: GSM, 3G, 4G, Wifi, Bluetooth, NFC etc. So they are suitable to protect credit cards, smart keys, documents.When You put the phone or smart device into bag, then it is impossible the eavesdropping over the network. THEMIS bags help to protect Your data and devices. Depending of the model there are up to 4 layers of lining. External material is resistant nylon, nanomaterial or natural leather.