Yeah. I saw an ad for an aluminum wallet recently.
Theoretically, that would greatly reduce EMR/RF getting in and out. Basically a Faraday cage. I had to build one around the sound equipment in a science museum with a massive Tesla coil in it. It worked.
Maybe I should wrap my cards in aluminum foil.
Maybe credit cards should offer non RFID as an option.
In Michigan If you get a enhanced drivers licenes so you can drive over to Canada it comes with some sort of paper sleeve. They say this will stop the unauthorized electronic readers from reading all your info.