RFID cards are relatively rare, and should not be confused with
contact smart cards. Those are the ones with the little square of gold or silver foil divided into segments that are designed to slide into a smart card reader. Those are completely impervious to
skimmers of either the RFID or magnetic type.
You should be aware though that if you swipe a smart card rather than inserting it into a reader it's the same as any other magnetic strip card and can be read by a magnetic skimmer.