Short answer: For most people, the easiest way to protect contactless cards is an RFID blocking card that slides into the wallet you already own. It covers the cards around it, adds almost no bulk, and means you do not have to replace your wallet or sleeve every card one by one.
Key takeaways
- Contactless credit and debit cards communicate at 13.56 MHz over very short distances.
- Your main options are blocking cards, blocking wallets, individual sleeves, DIY foil, and paying with your phone.
- The best protection is the one you will actually use every single day.
- No form of RFID protection is 100% effective in every scenario, and none of them stops phishing or data breaches.
What are your options for protecting contactless cards?
| Option | How it works | Main trade-off |
|---|---|---|
| RFID blocking card | Slides into your wallet next to your cards | Needs replacing every few years |
| RFID blocking wallet | Lined with blocking material | You must buy a new wallet, and cards are only protected while inside it |
| Individual card sleeves | One sleeve per card | Bulky, and easy to skip a card |
| DIY aluminum foil | Wrap cards or line a wallet | Inconsistent, wears out, awkward to use |
| Phone wallet | Pay with your phone instead of a card | Does not protect the physical cards still in your wallet |
Why does a blocking card work for most wallets?
A blocking card is the same size as a credit card, so it fits in any card slot. It uses battery-free technology to interfere with the signal a reader would need to talk to the cards near it. SignalVault uses patent-pending E-Field Technology, needs no charging, and each 2-pack gives you one card for each side of a longer wallet or one for a second wallet.
How do you know a blocker really works?
Look for independent testing at the right frequency. SignalVault was tested at 13.56 MHz, the frequency of contactless credit and debit cards, by Qualtest, Inc. (now N.T.S.), an ISO/IEC 17025 accredited laboratory. You can read the full test results here.
Frequently asked questions
Do I need to replace my wallet to use a blocking card?
No. A blocking card slides in with your other cards, so you keep the wallet you already like.
Does an RFID blocking card protect against all credit card fraud?
No. It protects against wireless scanning of contactless cards. It does not protect against data breaches, phishing, or compromised card readers.
How many cards does one blocking card protect?
It protects the cards in its immediate area of the wallet. Longer wallets with two card sections are the reason SignalVault comes as a 2-pack.
Want the simplest fix? The SignalVault RFID Blocking Card Protector (2-Pack) is $20 and ships within 2 business days. U.S. orders over $25 ship free. Learn how it works or read our guide on how to protect your cards from RFID skimming in 2026.