You must be able to prove your identity either by providing documents when asked or within 4 hours at a police station. Identity documents can be a passport, a photo driving licence or other documentation provided by a government body.
Concealing the face in public places in France is illegal. This includes balaclavas, full veils or any other garment or mask that is used to conceal the face. Failure to comply with the ban is punishable by a maximum fine of €150. Under this law, forcing someone to hide their face is also a crime and is punishable by a year’s imprisonment and a fine of up to €30,000. If the person forced to hide their face is a minor, the sentence is doubled. The law does not provide any exemption for tourists.