It is imperative you stay safe while travelling. RFID Blocking Wallets and Passport Covers are designed to help insulate you from a very particular brand of electronic pick-pocketing, called RFID skimming.
What is RFID? It stands for Radio Frequency IDentification. The concern is that some credit cards, passports, and driver's licenses now come with embedded radio frequency identification chips, making it easier for RFID skimming.
These Wallets, Passport Holders and Other Related items are designed with RFID Blockers built into them.