And are they literally tin or aluminum?
A tin-foil hat or aluminium foil deflector beanie is a piece of headgear made from one or more sheets of aluminium foil or similar materialSome people wear the hats in the belief that they act to shield the brain from such influences as electromagnetic fields, or against alien interference mind control and/or mind readingThe concept of wearing a tinfoil hat for protection from such threats has become a popular stereotype and term of derisionThe phrase serves as a byword for paranoia and is often used to characterize conspiracy theorists- wikipedia
