Hello Kitty Card Cases Arrive for RFID Protection

Well, I'm not sure this is the sort of thing I want to pull out of my back pocket in the men's locker room down at Gold's Gym, but that's me. Maybe it'll appeal to you? Here's the story:

"Hello Kitty Protects You from Skimming Attacks"
Shelly is a card for protecting RFID cards from skimming attacks. You just cover your RFID train pass (e.g., SUICA) or payment card (e.g., Edy) with this Shelly card and it disables the RFID's wireless communication.