A helmet (1) includes a shell (2), a support element (1 1) mounted on the shell, on the outer side thereof and above the facial opening (3), and at least a first visor (31) mounted pivoting in relation to the shell (2) around a pivot axis (30), between a lowered use position and a high retracted position. An articulating means (23) is provided between the support element (11) and the shell (2), to allow said support element to pivot in relation to the shell around a transverse axis (24) situated in the vicinity of the back edge (13) of the support element (11 ), between a lowered use position, in which said support element covers a portion of the shell (2), and a raised position. A locking means (22, 26) is also provided for locking the support element (11) in the lowered position.