Another material is the 'foil tape', self adhesive, aluminum, usually 1 1/2 to 2 inches wide. Stays in place on it's own. I've seen it at car parts (autozone, etc), as well as Walmart/Target.
Down here our passport cards are issued with a foil lined 'protector' so I do believe this is 'real'. I now use an aluminum wallet, plan on a leather one with the foil tape later.