Product Option: Genuine top grain cowhide - Hold your passport safe and secure in this USA-made leather RFID (Radio Frequency Identification) signal-blocking passport sleeve. This sleeve features perimeter stitching and silk lining in a compact design for easy storage on the go. All US passports and many credit cards have RFID chips embedded in them that contain your personal information. This strong RFID product will protect your identity with signal blocking technology that helps prevent identity theft. It measures 4 1/2" x 5 1/2" closed, is available in several colors and can be customized with your brand logo.