The cards are super protected from kinking (very important for me) and also against accidental reading of the chips.
I've tried the cards in the Protector on a chip reader down and he could not see anything, just pull the lever and the map was as far out that it has been detected.
Only in the purse-size one has to pay attention that it is large enough (I had to change).
To me, that part is really great !!