This case organizes your boarding pass and ID and keeps them handy for security and gate checks. But also, it blocks RFID, and this will become increasingly important, because all newly-issued U.S. passports include an RFID chip (radio frequency identification). The new chip contains personal information about you, and unless blocked, that information can be picked up by anyone passing nearby with the right kind of RFID reader. You can prevent unauthorized access to your personal information by keeping your passport safely inside this document holder, which blocks RFID waves. The fold-over front flap snaps closed, so travel documents hang securely around your neck with the adjustable neck strap. Includes a pen. Durable ballistic nylon with leather trim. Black.