We found that most products in this category share the same critical flaw: they only block at extremely close range, leaving your cards vulnerable to the longer-range scanners that real-world electronic pickpockets actually use.

Only one card in our testing lineup blocked 100% of scan attempts at distances up to 4 feet — a range that covers the vast majority of real-world RFID theft scenarios, from crowded subway cars to busy checkout lines.

We measured blocking effectiveness across three frequency bands (125 kHz, 13.56 MHz, and 860-960 MHz), tested at five distance increments (contact, 6 inches, 1 foot, 2 feet, and 4 feet), and evaluated durability through water submersion, bend testing, and 6 weeks of daily wallet carry. Here's what the data showed.