Features:
They are also puncture and tear resistant. 
Simply put your cards inside the sleeve and the aluminium foil
composite lining will prevent electronic pick pocketing.
Security Protector for bank cards. This protective rfid sleeve is for stopping phone scan attacks.
This happens a lot if you put your card ,near your cellphone too often,
Weather and water-resistant,which would caused information lost.
Slide into your wallet, purse, card holder or travel wallet size permitting or just use the sleeve as a mini wallet.