Abstract: A motor cyclist's helmet has a visor apertured at either side so that it can pivot on pivots projecting from the helmet. At one side, the aperture in the visor is elongate so that this side of the visor can be pushed forward, the visor being slightly deformed outwardly. A pin projecting from the helmet and received in a slot in the visor then permits the visor to be pivoted upwardly, which the pin and slot prevents when the visor is pushed back against the helmet. The visor can be operated by one hand, with the help of a projecting portion of the visor or a gripping member affixed thereto.