Quick answer: an RFID wallet contains a thin metallic shield (usually aluminum or copper alloy) that blocks the 13.56 MHz radio waves used by contactless cards, preventing scanners from reading them through the wallet.
How RFID blocking works
Contactless cards (EMV, transit passes, NFC) transmit via radio frequency identification at 13.56 MHz. A conductive metal layer creates a Faraday cage effect: radio waves cannot penetrate, so a scanner cannot power up or read the chip inside the wallet.
Do you need RFID protection?
Real-world skimming is rare but non-zero — electronic pickpocketing is documented in transit crowds. The cost of adding RFID shielding is small, so manufacturers increasingly include it as standard or as an option in OEM programs.
How to check if your wallet is shielded
- Wrap the wallet around your RFID card and hold it against a reader — the card should not read.
- Look for a copper/aluminum lining layer inside the card slot.
- Test with a phone NFC payment app: tap the wallet against the phone and confirm nothing is detected.
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