Thin aluminum RFID wallet, with money clip. RFID blocking wallets block RFID signals using electromagnetic enclosure technology called a Faraday cage. This technology is said to make credit cards electromagnetically opaque by distributing electrostatic charges or radiation around the cage’s exterior, thus protecting its contents from electric charges.
 
Radio frequency identification (RFID) skimming is a form of digital theft which enables information from RFID-equipped credit cards to be read and duplicated. It can be used as a form of wireless identity theft or credit card theft. Typically, it involves the illegitimate reading of RFID-enabled credit cards (or other devices) at a distance in order to download the card’s information. From there, the information can be written to a new blank card, which operates in the same manner as the original, legitimate card. Because the data is identical on both cards, and the information is only copied, it makes no difference if the original data is encrypted.