Abstract: Ski boot with a variable-volume shell (1), the shaft of which, which is articulated on the lower shell, is constituted by a front part (5) equipped with flaps and by a rear part (11), these two parts coming to be applied edge to edge against one another in the closed position. The two parts of the shaft are moreover connected to one another by two flexible bands (23) which are capable of being locked on the rear part (11) by a locking device (26), this device preferably being unlockable by the buckle (17) intended for clamping the shaft around the leg.

Abstract: The tightening device comprises a tensioning lever, to which there are connected a first traction member and a second traction member. The device comprises means, such as a boss, exerting a delayed traction on the second traction member at the time of opening of the tensioning lever.

Abstract: Ski boot consisting of a lower part and of a shaft, in the form of a collar, which is articulated on the lower part and provided with at least one closing buckle. The shaft comprises, at the rear, a rocker which interacts with a stop which is integral with the lower part in order to lock the shaft in a position inclined forwards. The rocker is held in inactive position upon opening of the uppermost buckle by means of a cable and of a spring. Thus, the shaft does not come to be locked at the wrong moment during walking.