Sport footwear, particularly a ski boot or the like

A sport footwear, comprising at least a rigid shell (20) having a front aperture (26), a front toe-box (24), and a front end portion (22) between the front aperture (26) and the front toe-box (24) along a longitudinal axis (X) of development of the rigid shell (20), and further comprising:

• a weakening notch (27) having an elongated shape and made through the front end portion (22) of the shell (20) and configured to allow a volumetric variation of the shell (20) at least in correspondence to the front end portion (22);
• and
• a tie-rod (30a, 130a, 230a) associated at an upper part to the weakening notch (27), to define the desired volumetric variation, the tie-rod being configured to act in traction in a direction transverse to the longitudinal median axis (X) and comprising at least a front terminal closing mechanism (30a, 130a, 230a) provided in the front end portion (22) overlapping the weakening notch (27), the front terminal closing mechanism (30a, 130a, 230a) being attached to lateral portions (25a, 25b) of the shell (20) which laterally delimit the front aperture (26) and being configured to assume at least an unclamped condition and a clamped condition in which the lateral portions (25a, 25b) are brought near each other.