Abstract: The ski boot comprises a shell to which is associated at least one quarter. An electric motor is contained in the boot and has at least a controlling portion accessible from the outside. The electric motor is electrically connected to an electric power source accommodated inside the boot and is mechanically connected with a speed reducer. The output shaft of the speed reducer is operatively associated with straps for closing the boot and/or with cables or mechanism for securing the foot inside the boot. In the controlling portion accessible from the outside, push-buttons are provided for selective actuation of the electric motor with the possibility of rotation in one direction and with the possibility of rotation in the opposite direction to vary accordingly the rotation of said output shaft.