From Thinkgeek:

Each Marvel’s Agents of S.H.I.E.L.D. RFID Blocking Wallet is made out of synthetic leather (which is harder to detect by Skrull bio-scanners). You’ll have a divided bill compartment, four card slots, and a clear ID slot. Plus, the Marvel’s Agents of S.H.I.E.L.D. RFID Blocking Wallet blocks RFID signals, to help protect your stuff even more. And, for those times you really have to lay down the law, your Marvel’s Agents of S.H.I.E.L.D. RFID Blocking Wallet has a debossed S.H.I.E.L.D. logo on the front. That way, everyone will instantly know the command you have over the situation.

[Marvel’s Agents of S.H.I.E.L.D. RFID Blocking Wallet]