RFID BLOCKING LINING
Most modern credit cards and passports contain small RFID chips that allow them to be scanned/read to interact with payment terminals (PayPass etc for credit cards) or to make them more difficult to copy (in the case of passports).
While this technology is terrific it is possible for this information to be skimmed illegally and like pickpocketing is of particular concern when travelling overseas.
I use Cryptalloy® (a RFID shielding foil I've sourced from Germany) to add an extra lining where you might keep your passport, wallet etc to protect against having your details stolen.
Please visit the Cryptalloy website for further information.