Why we choose accordion style card slots? Because accordion slots are better than those stair-like slots. You know, when we put a card in stair-like slot, we sometimes feel so tight that difficult in and out; sometimes feel too loose that we afraid the cards will slip out. So the accordion style slots will perfect solve this issue, when the wallet is open, it is very easy for cards in and out; when closed, with zip around design, the cards are stay nicely in places. Besides, accordion style looks cool, doesn't it? It's also a wallet with rfid blocking ,functional, secure,easy to use,and all in one. What is rfid blocking material ? It's basically tin foil layered between the material of the wallet that blocks the hacking wireless portable scanners used to withdraw financial info from your wallet,drivers license, credit cards, debit cards etc. These scanners have a chip that is used for transactions wirelessly but few retail stores, buildings and buses use it. Instead criminals are stealing your info more every year committing identity theft according to the fbi. "