A ski boot includes a cuff and a lower shell mutually coupled to define a substantially rigid support structure, and a liner defined to receive the foot of a user positioned inside the rigid support structure. The support structure has first and second end portions mutually slidable between a first initial position and a second operative position so as to vary the configuration of the ski boot. The ski boot further includes a plurality of elements for the connection of the end portions, and a single lever that can be maneuvered by the user and is connected with the connection elements, so that the action of the lever allows the displacement of the first and the second end portions from the first to the second position. The single actuation lever can be selectively actuated by the user and is configured to act simultaneously on all connection elements.

A closure device for a sports footwear s provided. The device facilitates insertion of the user's foot into the footwear and extraction of the same from the footwear. The closure device can switch from a closed position, in which the user's foot is immobilized within the footwear, to an open position in which the user's foot can be inserted into the footwear or extracted therefrom, and the device can be locked in a fixed position both when it is in its closed position and when it is in its open position. In particular, when it is in its open position, the closure device is locked in a position in which it does not hinder the operations of inserting the user's foot into the footwear and of extracting the user's foot from the footwear.

A sport footwear includes at least an upper part configured to act as an upper cuff and a lower part acting as a lower shell. The upper part has a pair of opposite and distanced lateral edges. At least one terminal closing mechanism is provided on the lateral edges and at least one other closing mechanism, positioned adjacent to the terminal closing mechanism, which extend frontally astride the lateral edges. The sport footwear includes a single command mechanism configured to drive both of the closing mechanisms at the same time. The command mechanism includes at least one main lever pivoted on a first of the lateral edges. Moreover, the closing mechanisms are each provided with a respective drive end connected to the main lever, near the first of the lateral edges, and with an opposite anchoring end connected to a second of the lateral edges.